JERUSALEM, JAN. 26 -- Israeli border police in the West Bank opened fire on Palestinian protesters today, wounding one, and Arabs threw firebombs at soldiers in the Gaza Strip.

The Palestinian was shot in the leg when dozens of protesters surrounded a patrol in the Jenin refugee camp, an Army spokesman said. He said the patrol used tear gas and rubber bullets first, then fired because their lives were in danger.

The Arab-run Palestine Press Service said Israeli gunfire wounded two other Arabs, one 12 years old, during protests at the West Bank town of El Bireh and the Jalazoon refugee camp near Nablus. Press photographers saw 15 Arabs detained at Jalazoon.

An Army spokeswoman denied that any Palestinians were wounded by shooting at El Bireh or Jalazoon. She said that a large demonstration began at Jalazoon after two foreign television crews entered the camp and that two Arab women were injured, one by a rubber bullet and one by beating.

Gen. Ehud Barak, chief of staff, said that the Army will restore tough curfews if necessary. "It could happen that long-term curfews will continue," the Israeli news agency Itim quoted him as saying. "Only with persistence and patience will we have a reasonable chance to reach relative calm."

Meanwhile, Israeli radio said a curfew was reimposed on the Jabaliya refugee camp in Gaza after protesters threw firebombs at soldiers. No injuries were reported. The camp has been under curfew for most of the past two weeks, and for 28 days since protests began, U.N. officials said.

Curfews also were put on the Jenin camp and two West Bank villages after today's demonstrations.

Street vendors sold vegetables in Arab East Jerusalem, but shops were closed for the 20th day to protest Army tactics. Stores reopened in Gaza City, and Itim said nearly all the 50,000 Palestinian Gazans who work in Israel went to their jobs.