Three US troops, 1 contractor killed in Afghanistan blast: Official

Three US troops and a contractor were killed in an explosion near Bagram Air Base on Monday, NATO said, after the Taliban claimed responsibility for the blast.

"Three US service members and one contractor were killed, and three US service members were wounded by an improvised explosive device April 8 near Bagram Air Base," the transatlantic military alliance's mission in Afghanistan, Resolute Support, said in a statement.