Met Police arrest four for arson
10 June 2013 Last updated at 08:06 BST
Four teenagers have been arrested after a fire at an Islamic boarding school in south-east London.
About 128 pupils and staff were evacuated from Darul Uloom School, in Foxbury Avenue, Chislehurst, on Saturday.
Two 17-year-olds and two 18-year-olds were arrested on suspicion of arson on Sunday, the Metropolitan Police said.
Speaking to the Today programme's Sarah Montague, Commander Simon Letchford said officers were asking members of the public to remain calm and not to speculate as to the cause of the fire.
He added: "There is an increased police presence around potentially vulnerable locations in the borough of Bromley and across London."
First broadcast on BBC Radio 4's Today programme on Monday 10 June 2013.