JERUSALEM, JAN. 31 -- Dozens of Arabs were hurt in clashes, including four protesters wounded by Army gunfire, and a Jewish settler was seriously burned in a car firebombing in the occupied territories today. In this city, riot police fought Arabs near one of Christianity's holiest shrines.

The Army clamped a curfew on Nablus, the West Bank's largest city with a population of 100,000, after lengthy street battles today with masked youths, authorities said. They said four Palestinians were wounded by gunfire.

One of the casualties, identified as 25-year-old Adnan Aslan, was in serious condition after being shot in the back, the Army said.

Throughout the West Bank and Gaza Strip, scores were injured after being beaten or inhaling tear gas, according to officials at several hospitals.

The Army said a firebomb tossed at a car in the West Bank city of Ramallah critically burned a Jewish settler.

In Jerusalem, near the Church of the Holy Sepulcher, where tradition says Jesus was buried, police fired tear gas to disperse about 200 protesters. Most of the demonstrators were women, who shouted anti-Israeli slogans after attending a memorial service for Palestinians killed in seven weeks of rioting.

According to United Nations figures, 39 Arabs have been killed by Israeli gunfire since protests began Dec. 9. The Palestinians are demonstrating against the Israeli occupation of lands seized during the 1967 Middle East war. No Israeli fatalities have been reported.

Later in the day, about 50 stone-throwing youths clashed with riot police firing tear gas near the church. Arab witnesses said police did not enter the church. Police arrested five Arab youths after the second protest.

At the Greek Orthodox St. George's Church in Ramallah, soldiers fired tear gas to disperse about 200 worshippers who left the church to march toward the city's nearby central square, said Ibrahim Duaybis, son of the minister at the city's Anglican Church.

Up to now, Palestinian Christians, who tend to have more moderate political views than their Moslem brethren, have played a minor role in the rioting led by Islamic fundamentalists and Palestinian nationalists.

But on Friday, in a first show of organized involvement, leaders of various Christian denominations called for a day-long fast to express solidarity with the rioters.

In Nablus, stones littered the city's deserted streets, and columns of thick smoke from burning tires rose from several sites as masked youths fought protracted street battles with soldiers.