An al Qaida terror suspect was "reassured" seeing police outside his house moments before they smashed their way inside and allegedly beat him up, a court has heard.
Babar Ahmad was in bed with his wife at around 5am on December 2, 2003 when the Anti-Terrorist Branch forced their way in to arrest him.
He was allegedly beaten up and mocked by four officers from the Territorial Support Group who were assisting the raid.
The 37-year-old told Southwark Crown Court he was woken by a massive bang on his door and thought a car had driven into the semi-detached property in Fountain Road, Tooting, London, more than seven years ago.
He said: "Initially I was in shock, confusion and panic. I didn't know what had happened I didn't have the foggiest idea.
"When I saw the police I felt somewhat reassured. I thought: It's the police, it's only the police, it's not a car crash or a robber."
He said officers in full riot gear ran up the stairs and despite him standing passively with his hands up he was thrown head first into a window. The officers then beat him he said, while shouting "vulgar abuse and language".
Mr Ahmad, who is in custody awaiting extradition to the US for alleged terrorism involvement, said: "That was the first time in my life that the police have raided my house in the middle of the night. It was complete confusion and shock.
"I had just woken up and lots of things were going through my mind: Why have they come up here? Have they mixed me up with someone else? Is there a robber hiding in my house? Or have they come to arrest me? All these things were going through my mind."
Police constables Roderick James-Bowen, 40, Mark Jones, 43, Nigel Cowley, 34, and Detective Constable John Donohue, 37, deny assault.