JERUSALEM - Three Palestinians were shot and killed in separate clashes with Israeli security forces in the West Bank on Thursday as Israel announced plans to strengthen a fence near the flash-point city of Hebron in an effort to contain a two-month spate of violence.

In the first incident, the Israeli military said a clash erupted after troops raided the village of Qattana overnight to search for ammunition and arrest suspected assailants. The Palestinians hurled firebombs and stones at troops, according to the army.

Yehya Taha, 21, was shot in the head and later died, according to Palestinian Health Ministry spokesman Mohammed Awawdeh.

Later in the day, Israeli border guards shot and killed a Palestinian attacker wielding a knife near the West Bank city of Nablus.

Police spokeswoman Luba Samri said the man got out of a taxi near a military post and began running toward officers, brandishing a knife. No Israelis were hurt in that attack, Samri added. She did not say how close the man got to the Israeli forces.

The Palestinian Health Ministry identified the assailant as 51-year-old Samir Seresi.

Late Thursday, it said a 21-year-old Palestinian was killed in clashes with soldiers near Hebron in the West Bank. The Israeli military said the Palestinian was about to throw a firebomb at passing traffic when soldiers opened fire.

The deaths were the latest in a two-month wave of violence. Since mid-September, 19 Israelis have died in Palestinian attacks, mostly stabbings and shootings. At least 94 Palestinians have also died, including 58 said by Israel to be attackers. The others died in clashes with Israeli forces.

In an effort to quell the violence, Defense Minister Moshe Yaalon announced Wednesday that Israel will fortify an existing fence west of Hebron, a southern West Bank city that has been a flashpoint in the current unrest.

Yaalon said attackers have managed to get through the structure in recent weeks.