LONDON - British police have arrested three men and a woman in connection with the attacks on the United States last week.
"They were arrested in connection with the World Trade Center terrorist attack and are being questioned by Anti-Terrorist Branch officers," a Scotland Yard statement said.
A man, aged 27 and a woman, 25 were arrested at a house in west London last night (NZT). A 29-year-old man was arrested later in the city of Birmingham, and was also taken to London for questioning, police said.
Metropolitan Police Commissioner John Stevens said that London was on the highest peacetime security alert in its history, with 1500 extra officers on the streets this weekend.
"London is at risk because it is one of the world's major capital cities, although there has been no specific threat," he said.