By blowing himself up, apparently:

BEIT LAHIYA, Gaza Strip — A blast flattened the house of a militant commander in the Gaza Strip Thursday, killing three people, wounding 40 and burying an unknown number of others, Palestinian officials said. Israel, which routinely accepts responsibility for attacks on military targets, denied involvement. But Hamas said the blast was caused by an Israeli airstrike and responded with a heavy barrage of rockets and mortar shells into southern Israel, wounding an Israeli woman. The spiraling violence threatened to undermine last-ditch efforts to secure a truce between Israel and Hamas and stave off an Israeli invasion of Gaza. Israel’s denial raised the possibility that the blast was caused by explosives meant for use against Israel that went off prematurely.