One of the four men arrrested by Scotland Yard on suspicion of conspiring to commit terrorism in Syria is Tarik Hassane - a man dubbed "the Surgeon".
Police launched a series of dawn raids across London at around 5am on Tuesday 7 October.
Medical student Hassane and three other men, aged between 20 and 21, are believed to have been Tasered before being detained on suspicion the group was preparing acts of terror.
The swoop was part of an an ongoing investigation into Islamist-related terrorism, the Metropolitan Police Service said. The group remain in police custody.
Met Police commissioner Sir Bernard Hogan-Howe described the arrests as a "quite serious case".
"It's one of a series of arrests that we've had over the last few weeks, which taken together for me confirm that the drumbeat around terrorism has changed," he told BBC London.
"It's a more intense drumbeat. We're having to be more interventionist and a lot of it is linked back to Syria and Iraq."
The Muslim Cultural Heritage Centre in Ladbroke Grove, west London, near to where Hassane lives, told IBTimes UK it had "no information" on the terror suspects.