Joe Biden Pays Tribute To Boston Police Officer Sean Collier

US Vice President Joe Biden has led tributes to the police officer who was killed during the hunt for the Boston marathon bomber.

Biden spoke at the funeral of 26-year-old Sean Collier, who is believed to have been killed by Dzhokhar and Tamerlan Tsanaev.

He was joined by thousands of police officers and students from the Massachusetts Institute of Technology, where Collier was based.

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