goma democratic republic congo militants attack two military base northeastern democratic republic congo monday kill two u.n. peacekeepers injure several others u.n. mission army say mission know monusco say deploy attack helicopters response raid army say battle militants along main road lead north kivu province beni territory uganda border fight begin weekend fresh outbreak violence region plague ethnic tensions massacre kill 800 people 2014-2016. gunmen believe belong ally democratic force adf ugandan islamist group active near border attack u.n. peacekeeping base village mamundioma 30 km 20 miles northeast beni monusco say statement region see enough violence already mission chief maman sidikou say reiterate arm group continue threaten kill civilians monusco respond respond strongly army spokesman mak hazukay say attack carry simultaneously hit u.n. base house tanzanian peacekeepers form part intervention brigade mandate conduct offensive operations militants hazukay say late u.n. helicopters shell rebel position inside virunga national park congolese troop fight recover stretch road rebel adf believe authorities ambush kill many civilians nearby weekend lull attack civilians near beni year omar kavota lead organization monitor violence north kivu say adf fighters kill least three civilians saturday slit throats take another 19 hostages monusco say accord initial report 20 civilians kill congolese authorities blame adf nearly massacre 2014-2016. however independent u.n. experts say several arm group well national army commanders involve militants attack east congo base kill two u.n. peacekeepers