LONDON -- British police arrested four teenagers late Sunday on suspicion of setting fire to an Islamic school amid fears of anti-Muslim attacks in retribution for the brutal killing of a soldier last month.
The Metropolitan Police said four males, two aged 18 and two aged 17, were being held at a South London police station. Police presence was being increased "around locations that might be at risk," police said.
The fire occurred late Saturday night at the Darul Uloom Islamic High School & College in Southeast London and was quickly extinguished, police said. There were minor damages to the building, which was briefly evacuated.
The incident follows another suspected arson attack at an Islamic center in North London on Wednesday. In that attack, "EDL" -- the far-right group English Defence League -- was found written on the building, but the group said it was not involved in the fire.
"We should not allow the murder of Lee Rigby to come between Londoners," Police Commissioner Sir Bernard Hogan-Howe said in a statement. "The unified response we have seen to his death across all communities will triumph over those who seek to divide us."
Rigby, 25, was killed in broad daylight by knife-wielding assailants last month outside an army barracks in South London.
One of the alleged attackers, still holding a bloody cleaver, was filmed by a witness as saying: "By Allah we swear by the almighty Allah and we will never stop fighting you until you leave us alone."
The gory murder has raised fears of reprisal attacks against Muslims.