Egyptian army tanks advance through the desert in the Sinai Peninsula.<br/> <br />They're hunting for militants, following deadly overnight clashes between security forces and insurgents.<br/> <br />The militants were blamed for an attack on Sunday that killed 16 soldiers.<br/> <br />Overnight, automatic gunfire rang out as fighting raged.<br/> <br />The violent clashes were reportedly followed by a series of air strikes on targets surrounding the town of Sheikh Zuwaid, 10 kilometres from the Gaza Strip, that killed 20.<br/> <br />Sunday's attack was the bloodiest assault on security forces in Sinai since Egypt signed a peace treaty with Israel in 1979.<br/> <br />The attackers also stormed through the border into Israel but were killed by Israeli gunfire.
