Nobody is above the law, says Hamas after rival groups clash By Tim Butcher in Jerusalem (Filed: 03/04/2006) Hamas yesterday faced its toughest internal challenge since being swept unexpectedly to power in the Palestinian territories when rival militant groups in Gaza took part in a series of clashes that left four dead and dozens wounded. Clashes were sparked by the murder of Abu Yussef al-Gouga Said Siam, the newly appointed Hamas interior minister, appealed for calm and warned that his government would clamp down heavily on armed groups who used their weapons against each other rather than in the struggle...