Israeli tanks opened fire in the southern Gaza Strip after a 72-hour truce began Friday, a Reuters photographer and the Palestinian Interior Ministry said, and Hamas media reported that four people were killed.
The Israeli military had no immediate comment.
Earlier, Israeli media reported that rocket sirens had gone off in southern Israel, just two hours into a 72-hour truce between Hamas and Israel announced by the United Nations and United States.
Israeli newspaper Haaretz reported that sirens went off in an Israeli town near the Gaza border just after 10 a.m.
The truce began at 8 a.m. Friday morning, and negotiators are gathering in Cairo in an effort to extend the cease-fire and end the 25-day war, which has killed more than 1,400 Palestinians.
