Israeli troops opened fire across the Syrian frontier on Sunday to disperse hundreds of pro-Palestinian protesters who stormed the border of the Israeli-controlled Golan Heights. Syrian television reported four people, including a 12-year-old boy, were killed by Israeli gunfire. The unrest marked the anniversary of the Arab defeat in the 1967 Mideast war. The Israeli military accused Syria of instigating the disturbances to deflect attention from its bloody crackdown on a popular uprising at home. Israel had promised to prevent a repeat of a deadly protest last month, in which hundreds of people burst across the frontier, entered the Golan and clashed with Israeli forces. Thousands of troops were mobilized in anticipation of possible unrest. "Unfortunately, extremist forces around us are trying today to breach our borders and threaten our communities and our citizens. We will not let them do that," Prime Minister Benjamin Netanyahu told his Cabinet. He said security forces had been ordered to show "maximum restraint."