JERUSALEM (AP) - Militants crossed from Egypt's turbulent Sinai Peninsula into southern Israel on Monday and opened fire on civilians building a border security fence, defense officials said. One of the Israeli workers was killed, and two assailants died in a gunbattle with Israeli troops responding to the attack. No group claimed responsibility for the attack, which underscored the growing lawlessness in the Sinai desert since longtime Egyptian President Hosni Mubarak was toppled by a popular uprising last year. Military spokeswoman Lt. Col Avital Leibovich said the assailants have not been identified but acknowledged that defense officials suspected Palestinian militants in the Hamas-run Gaza Strip, which also borders the Sinai desert in that same area, might have been involved. http://apnews.myway.com/article/20120618/D9VFIAO00.html