KABUL, Afghanistan (AP) — A NATO bomb mistakenly hit a house 1 1⁄2 miles off target Tuesday, killing two civilians and wounding 10 even as Afghanistan’s president was saying that terrorism cannot be defeated if innocents are killed in coalition operations. In a separate incident in eastern Afghanistan, a roadside bomb killed an Afghan contract worker and three soldiers in the U.S.-led coalition, the coalition said. NATO said the bomb that went off target was aimed at a spot used by insurgents to fire rockets in eastern Khost.