A roadside bomb in northern Afghanistan struck an ambulance on Monday, killing five civilians, including a pregnant woman, officials said. The incident took place in the city of Sar-e-Pul, according to a report of DPA. "A roadside mine which was placed by enemies of peace and stability hit an ambulance in the Qosh Tipa (area of the city), killing five members of a family including a pregnant woman and injuring two others," the Interior Ministry said in a statement. A total of 579 Afghan civilians were killed during the first four months of 2012, according to a United Nations report in May.