NABLUS, West Bank (Reuters) - Palestinian gunmen clashed with Palestinian Authority security forces in the occupied West Bank on Tuesday, killing a man in clashes that erupted after the arrest of two of the gunmen, witnesses and medics said.

Hamas, a rival to the Western-backed Palestinian Authority, said the authority had arrested one of its prominent members wanted by Israel and another gunman in the city of Nablus.

There was no immediate comment from the Palestinian Authority, which has been criticized by Israel and the United States for not doing enough to rein in militants in key militant strongholds such as Nablus and the nearby city of Jenin.