Five U.N. peacekeepers were injured when rebels ambushed their vehicle in eastern Democratic Republic of Congo on Monday, Reuters cited the U.N. mission in the country as saying. Two people on motorbikes attacked the U.N. vehicle with a grenade near the airport of Mavivi de Beni, the U.N. peacekeeping mission MONUSCO said in a statement on Tuesday. It vowed to continue fighting against armed groups in the region. The Congolese army, backed by the United Nations, has been fighting a Ugandan militant group known as the ADF-NALU militia since December following rebel attacks against civilians in the eastern province of North Kivu. Monday's attack immediately followed comments from a Congolese army spokesman who said that it had destroyed the bases of ADF-NALU and aimed to crush the rebels in the next few days.