Gaza truce begins after Hamas rocket salvo at Israel

JERUSALEM (Reuters) - An Egyptian-mediated truce halting the Gaza war went into effect on Tuesday following a surge in cross-border rocket fire into Israel by the Palestinians Islamist group Hamas. The ceasefire, which is meant to last 72 hours and allow for negotiations in Cairo on a more durable cessation of hostilities, began at 8 a.m. (0500 GMT). Minutes before, air raid sirens sounded throughout southern Israel and as far north as outlying areas of Jerusalem, triggered by a volley of rockets that Hamas claimed responsibility for. There was no immediate word of casualties. (Writing by Dan Williams; Editing by Robert Birsel)