Manila, 08 Jumada I,1437 AH, 17 February,2016 , SPA -- Four people were killed and three others were injured in an explosion set off by rebels in the southern Philippines, the military said Wednesday according to dpa. The victims, including a local official, were in a van in Datu Ampatuan town in Maguindanao province when the bomb exploded on Tuesday evening, Lieutenant Colonel Warlito Limet said. The attack could have been aimed at government forces, he said. Earlier Tuesday, gunmen and army soldiers engaged in a three-hour firefight in the same province. -- SPA 12:26 LOCAL TIME 09:26 GMT www.spa.gov.sa/w