JERUSALEM, JAN. 5 -- Israeli soldiers opened fire twice today on Arabs in the Gaza Strip town of Khan Yunis, killing an 18-year-old man and wounding eight others as violent protests erupted again in the occupied territories over Israel's plan to expel nine Palestinians.

The West Bank and Gaza, which last week appeared to be calming down, have now been hit by three straight days of new violence following the government's announcement Sunday of the expulsion orders and the shooting death that same day of a Palestinian woman in an Arab suburb of Jerusalem.

Israeli soldiers have shot to death at least 24 Palestinians and wounded more than 180 during the riots, which are beginning their fifth week.

Today's most serious violence occurred in Khan Yunis, scene of sporadic protests since Israel said it would expel Hasan Ghanim Abu Shakra, a Moslem fundamentalist leader.

Abu Shakra's supporters hit the streets again this morning, burning tires and stoning vehicles, witnesses said. Israeli soldiers at first employed the tactics the Army has used in the past two weeks, watching from the periphery and occasionally firing tear gas or using a water cannon against small groups of rioters.

At around noon dozens of residents marched to Abu Shakra's house and then to a local mosque. On the way, they came upon an Army patrol and began pelting soldiers with stones, according to the Army's account.

One soldier was hit in the face, the Army said, and when tear gas and rubber bullets failed to disperse the crowd, an officer opened fire, first into the air and then at the legs of the Palestinians. One of the bullets, which the Army said may have ricocheted, struck Adel Dahalan in the chest, and he later died at a hospital. Four others were wounded.

Another patrol opened fire in a separate part of the town, injuring three persons, according to the Army. Gen. Yitzhak Mordechai, the Gaza military commander, interrogated soldiers at the scenes and said the shootings were justified in both instances.

Later an eighth person was wounded during disturbances in Gaza City, residents said. Four other soldiers were also lightly injured in the Gaza Strip town of Rafah, according to the Army.

Violence continued into the evening. At one point, a group of masked men climbed into the Salheddin mosque in Gaza City, raised the Palestinian flag from the minaret and pelted passing cars with rocks. Israeli soldiers surrounded the building but did not enter for fear of inciting Moslems.

There was also sporadic violence in West Bank towns and refugee camps that are the homes of some of the other activists slated for expulsion and in Ram, the suburban town where the woman was killed Sunday. Activists imposed commercial strikes in several towns in Gaza and the West Bank, and someone threw a gasoline bomb at a tourist bus in Arab East Jerusalem, causing minor damage but no injuries.

When the government announced the expulsions two days ago following a week-long lull in last month's violence, residents warned that the action could set off another round of disturbances.

The United States and other western governments have strongly opposed the expulsion orders, which they said are a violation of due process and the Fourth Geneva Convention of 1949. Israeli officials contended the measures are necessary to protect state security and to restore order to the occupied territories.

{In Washington, the State Department called on Israel and Palestinian demonstrators to exercise "calm and restraint." After several days of muted reaction to reports of growing violence, spokesman Charles Redman said, "We deeply regret the death . . . in Gaza today," United Press International reported.}

A senior Israeli official, speaking not for attribution, rejected the suggestion that the expulsions had triggered the new violence.

"We knew things were not calm and quiet but we feel we had to remove those elements instigating the trouble," he said.

The Army chief of staff, Gen. Dan Shomron, told a parliamentary committee today that the soldier who killed a 25-year-old woman on Sunday had violated orders by chasing stone throwers through the village of Ram and becoming separated from his unit. The soldier only opened fire in the air when he was surrounded by residents and his life was endangered, Shomron told the closed-door session, according to Israeli radio, and the woman, who was on a porch overlooking the soldier, was killed accidentally.

Shomron's version contradicts an account by a witness, who said the soldier whirled and fired at the woman after she warned him not to harm a youth he had grabbed. The general's version did not explain two other bullet holes found in an apartment house nearby.

Shomron rejected calls from left-wing members of the Knesset, or parliament, for the Army to withdraw from refugee camps. If it did so, he warned, the camps would be taken over by nationalist organizations and would be used as springboards for terrorist attacks on Israel.

A group of prominent West Bank Palestinians is seeking to encourage a new tactic, civil disobedience. This would involve organizing a mass movement that would engage in nonviolent acts of defiance of the occupation authorities such as refusing to carry Israeli identification cards and raising the outlawed Palestinian flag outside their homes.

The group's spokesman is Hanna Siniora, a Palestinian newspaper editor considered a political moderate who has close ties to the outlawed Palestine Liberation Organization. Its ideologist is Mubarak Awad, an Arab-American who runs a nonviolence study center here.

David Mellor, the British minister of state for foreign affairs who yesterday lambasted Israel's conduct in the Gaza Strip and rebuked an Israeli Army officer there, met this afternoon with Prime Minister Shamir. Neither side commented immediately after the session.

But Shamir's spokesman Avi Pazner told British television later that it was "a very frank meeting" in which Shamir "stressed the importance of dialogue between friendly countries like Britain and Israel." Pazner said Mellor's remarks were the kind that should be made in "private conversations," and added that it was "regrettable that instead of speaking like among friends" Mellor made his comments in public.

Other Israeli officials reacted with outrage. President Chaim Herzog accused Mellor of "cynicism and hypocrisy," and mocked him for offering "unsolicited advice which is given to us by countries who have not solved similar situations any differently," a reference to Britain's problems in Northern Ireland.

In London, the British Foreign Office said Mellor's remarks had been consistent with government policy. A spokesman said, "he didn't say anything that has not already been laid down in official government policy many times . . . we've said these things before and no one has taken any notice."Washington Post correspondent Karen DeYoung in London contributed to this report.