AlQa'dah 20, 1434, Sep 26, 2013, SPA -- Unknown militants killed three people and injured eight others in two separate attacks near Kenya's north-east border with Somalia, police said Thursday. Heavily armed men fired rocket-propelled grenades into buildings in the town of Mandera in the early morning hours, killing two policemen and wounding four civilians, a police source told dpa. The attackers set twelve vehicles ablaze. Hours earlier gunmen stormed the town of Wajir, killing one person and injuring four after a grenade was hurled inside a market, the Interior Ministry wrote on Twitter.