Palestinian resistance fighters have detonated a roadside bomb alongside an Israeli military vehicle on the Gaza Strip border, wounding three soldiers, Aljazeera reported. But the Israeli army said only one soldier was moderately injured. The explosion on Thursday threatened a fragile ceasefire between Israel and the Palestinians, and came just hours before the two sides were set to hold their first meeting on coordinating Israel's planned withdrawal from Gaza. Thursday's bombing occurred on the Israeli side of the Karni crossing, the main transit point for cargo going in and out of Gaza, the army said. It was not immediately clear how fighters planted the bomb. Gaza is enclosed by a fence that makes infiltrations extremely difficult. Palestinian residents in the area said Israeli troops began firing machine guns after the explosion, and an army helicopter was seen landing in the area.