Bulgarian students have chained the gates to their university and demanding the government resign, following months of protests over poverty and corruption.

Sofia University was locked up by its students, bringing academic business at the institution to a "complete halt", according to the Novinite news agency.

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Thousands of Bulgarians took to the streets on Sunday to mark the 150th day of anti-government demonstrations, chanting “Resign,” “Mafia” and “Shame on you” as they passed parliament, AFP reported.

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  • BULGARIA-POLITICS-PROTEST

    A banner reading '?ccupied' is seen on Sofia's university building on November 11, 2013. Angry students chained and padlocked the doors to Bulgaria's largest university in Sofia on Monday, demanding the resignation of the embattled Socialist-backed government. The European Union's poorest member state has been rocked by mass anti-government unrest since February, but the demonstrations had subsided in recent months. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    A student stands next a closed entrance of Sofia's university on November 11, 2013. Angry students chained and padlocked the doors to Bulgaria's largest university in Sofia on Monday, demanding the resignation of the embattled Socialist-backed government. The European Union's poorest member state has been rocked by mass anti-government unrest since February, but the demonstrations had subsided in recent months. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    Students stand next a closed entrance of Sofia's university on November 11, 2013. Angry students chained and padlocked the doors to Bulgaria's largest university in Sofia on Monday, demanding the resignation of the embattled Socialist-backed government. The European Union's poorest member state has been rocked by mass anti-government unrest since February, but the demonstrations had subsided in recent months. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    People walk past Sofia University's main building on November 11, 2013. Angry students chained and padlocked the doors to Bulgaria's largest university in Sofia on November 11, demanding the resignation of the embattled Socialist-backed government. The European Union's poorest member state has been rocked by mass anti-government unrest since February, but the demonstrations had subsided in recent months. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    A woman stands next to the statue of Sofia University benefactor Hristo Georgiev on November 11, 2013. Angry students chained and padlocked the doors to Bulgaria's largest university in Sofia on November 11, demanding the resignation of the embattled Socialist-backed government. The European Union's poorest member state has been rocked by mass anti-government unrest since February, but the demonstrations had subsided in recent months. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    People stand next to the statue of Sofia University benefactor Hristo Georgiev on November 11, 2013. Angry students chained and padlocked the doors to Bulgaria's largest university in Sofia on November 11, demanding the resignation of the embattled Socialist-backed government. The European Union's poorest member state has been rocked by mass anti-government unrest since February, but the demonstrations had subsided in recent months. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    A banner reading 'Slave to freedom' hangs on a balcony of Sofia University's main building on November 11, 2013. Angry students chained and padlocked the doors to Bulgaria's largest university in Sofia on Monday, demanding the resignation of the embattled Socialist-backed government. The European Union's poorest member state has been rocked by mass anti-government unrest since February, but the demonstrations had subsided in recent months. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • Sofia University amateur theatre students perform during a demonstration in central Sofia, Friday, Nov. 1, 2013, demanding the dissolution of Parliament and calling for new elections. Several hundred students, who have occupied many universities for a week, were joined on Friday by teachers in their demands for an effective nationwide strike. (AP Photo/Valentina Petrova)

  • A student wrapped in the Bulgarian flag shouts anti-government slogans during a demonstration in central Sofia, Friday, Nov. 1, 2013, demanding the dissolution of Parliament and calling for new elections. Several hundred students, who have occupied many universities for a week, were joined on Friday by teachers in their demands for an effective nationwide strike. (AP Photo/Valentina Petrova)

  • Sofia University amateur theatre students perform during a demonstration in central Sofia, Friday, Nov. 1, 2013, demanding the dissolution of Parliament and calling for new elections. Several hundred students, who have occupied many universities for a week, were joined on Friday by teachers in their demands for an effective nationwide strike. (AP Photo/Valentina Petrova)

  • A protestor holds the Bulgarian flag during a demonstration in central Sofia, Friday, Nov. 1, 2013, demanding the dissolution of Parliament and calling for new elections. Several hundred students, who have occupied many universities for a week, were joined on Friday by teachers in their demands for an effective nationwide strike. (AP Photo/Valentina Petrova)

  • A blindfolded protestor plays on his trumpet during a demonstration in central Sofia, Friday, Nov. 1, 2013, demanding the dissolution of Parliament and calling for new elections. Several hundred students, who have occupied many universities for a week, were joined on Friday by teachers in their demands for an effective nationwide strike. (AP Photo/Valentina Petrova)

  • Blindfolded protestors shout anti-government slogans during a demonstration in central Sofia, Friday, Nov. 1, 2013, demanding the dissolution of Parliament and calling for new elections. Several hundred students, who have occupied many universities for a week, were joined on Friday by teachers in their demands for an effective nationwide strike. (AP Photo/Valentina Petrova)

  • Blindfolded protestors shout anti-government slogans during a demonstration in central Sofia, Friday, Nov. 1, 2013, demanding the dissolution of Parliament and calling for new elections. Several hundred students, who have occupied many universities for a week, were joined on Friday by teachers in their demands for an effective nationwide strike. (AP Photo/Valentina Petrova)

  • BULGARIA-POLITICS-PROTEST-STUDENTS

    Bulgarian students, one of them wearing a bandage on his eyes, stage a protest in front of the Parliament building in Sofia on November 1, 2013. Students marching in Bulgarian capital called for the beleaguered Socialist-backed government's ousting, amid continuing protests and occupations in universities around the country. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST-STUDENTS

    Students carry a protestor wearing a ballet dancer costume as they demonstrate in Sofia on November 1, 2013. Students marching in Bulgarian capital called for the beleaguered Socialist-backed government's ousting, amid continuing protests and occupations in universities around the country. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST-STUDENTS

    Bulgarian students with bandages covering their eyes attend a protest in Sofia on November 1, 2013. Students marching in Bulgarian capital called for the beleaguered Socialist-backed government's ousting, amid continuing protests and occupations in universities around the country. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-CORRUPTION-UNIVERSITY-DEMONSTRATION

    Bulgaria's students with bandages over their eyes shout anti-government slogans in front of Sofia's university on November 1, 2013. Students marching in Bulgarian capital called for the beleaguered Socialist-backed government's ousting, amid continuing protests and occupations in universities around the country. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    Bulgarian students shout anti-government slogans during a protest in Sofia on October 29, 2013. Angry students occupied university buildings that have injected new life into a persistent anti-government movement that is now into its 139th day. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    Supporters of students protest in front of Sofia's university on October 29, 2013. Angry students occupied university buildings that have injected new life into a persistent anti-government movement that is now into its 139th day. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • BULGARIA-POLITICS-PROTEST

    Bulgaria's students hold an EU flag and shout anti-government slogans in front of Sofia's university on October 29, 2013. Angry students occupied university buildings that have injected new life into a persistent anti-government movement that is now into its 139th day. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

  • Supporters of students demonstrate in front of Kliment Ochridsky University in Sofia, Monday, Oct. 28, 2013. Several hundred students blocked access to Bulgaria’s largest university on Monday, demanding the dissolution of Parliament, calling for new elections and bemoaning a lack of “moral values” at high levels. The protest will likely energize an anti-government movement that has spent four months protesting the country’s leadership. (AP Photo/Valentina Petrova)

  • BULGARIA-POLITICS-UNIVERSITY

    A student looks out through a closed entrance with a placard reading 'Occupation' at Sofia's university on October 26, 2013. Angry students blockaded Bulgaria's largest Sofia university on Saturday, pressing for the country's Socialists-backed government to resign and for new morals in politics. AFP PHOTO / DIMITAR DILKOFF (Photo credit should read DIMITAR DILKOFF/AFP/Getty Images)

Chaining the gates of the country's biggest university was the latest step in a three-week protest by students, who had previously occupied a lecture hall.

Sit-ins, are also taking place at another 15 universities across the country. "We are protesting against poverty and unemployment", a student declaration said, quoted by AFP news agency. "We are protesting before we become beggars with a higher education."