Update: Sky News is reporting that one of the people arrested is an NHS doctor. A Metropolitan Police spokesman told Huffington Post UK that this is a line of enquiry but was not something that could be confirmed.
Two people have been arrested at Heathrow Airport as part of an investigation into travel into Syria in support of alleged terrorist activity.
A man and a woman were arrested on suspicion of committing terrorism offences at 8.30pm on Tuesday after arriving on a flight into the airport.
The pair, both aged 26, were arrested by officers from the Metropolitan Police's Counter Terrorism Command on suspicion of the commission, preparation or instigation of acts of terrorism.
They were taken to a central London police station where they remain in custody.
The arrests are part of an investigation into travel to Syria in support of alleged terrorist activity.
Officers are searching two addresses in east London under the Terrorism Act in connection with their inquiries.
According to think tank the Quilliam Foundation there are around 1,200-1,500 foreign fighters across Syria. In August the BBC reported British fighters were joining the Syrian rebels' cause.
"I'm extremely concerned at the moment because I see similar things to those that happened in Afghanistan. We encouraged people to fight - to fight for the jihad. In the Syrian situation, similar messages are going out. Quite a number in Birmingham are heading out," Birmingham MP Khalid Mahmood said.
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