JERUSALEM?Israeli commandos tracked and killed four militants who slipped across the border from Jordan, and six other people were killed in Mideast violence as U.S. envoy Anthony Zinni planned a new round of truce talks Sunday night.

Palestinian militants fatally shot an Israeli woman riding a bus in the West Bank on Sunday morning, and Israeli troops pursuing the attackers killed a Palestinian policeman nearby.

The violence came as Zinni made his latest attempt to arrange a cease-fire in advance of an important Arab summit that starts Wednesday. He faces pressure to reach a deal before the summit in Beirut, Lebanon, which will focus on the Israeli Palestinian conflict.

Yasser Arafat would be one of the central figures at the summit, but Israel has not given him permission to go?and Prime Minster Ariel Sharon suggested that Israel would keep the Palestinian leader grounded if violence persists.