JERUSALEM -- A fourth Palestinian has died in the West Bank Monday, but the circumstances of the man's death aren't clear.

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Palestinians say the 18-year-old was taken away by Israeli border police and beaten. They say when he was brought back, he died. The Israeli military had no immediate comment.

Earlier Monday, a Palestinian gunman was killed after he broke through a fence separating Israel and the Gaza Strip and shot at soldiers. The army says soldiers returned fire and killed the attacker.

Soldiers also killed a man during a clash in the West Bank city of Nablus. Witnesses say the man was lighting another protester's firebomb.

And in Jenin, soldiers killed an unarmed Palestinian motorist after his car rammed a jeep that was parked near a checkpoint.