KABUL, Afghanistan (AP) – Police shot four protesters to death Wednesday to stop hundreds from marching on a southern U.S. military base, and Islamic organizations called for an end to deadly rioting across the Muslim world over drawings of the Prophet Muhammad.

“Islam says it’s all right to demonstrate but not to resort to violence. This must stop,” said senior cleric Mohammed Usman, a member of the Ulama Council _ Afghanistan’s top Islamic organization. “We condemn the cartoons but this does not justify violence. These rioters are defaming the name of Islam.”

Other members of the council went on radio and television Wednesday to appeal for calm. It followed a statement released Tuesday by the United Nations, European Union and the world’s largest Islamic group urging an end to violence.

“Aggression against life and property can only damage the image of a peaceful Islam,” said the statement released by Ekmeleddin Ihsanoglu of the Organization of the Islamic Conference, U.N. Secretary-General Kofi Annan and the EU chief Javier Solana.

President Bush called upon governments Wednesday to stop the violence and protect the lives of diplomats overseas.

“We reject violence as a way to express discontent with what may be printed in a free press,” Bush said after meeting with King Abdullah II of Jordan, who asked demonstrators to “express their views peacefully.”

In Baghdad, Iraq’s top Shiite political leader criticized attacks on foreign embassies by Muslims.

“We value and appreciate peaceful Islamic protests,” said Abdul Aziz al-Hakim. “But we are against the idea of attacking embassies and other official sites.”

Meanwhile, a U.S. military spokesman said the United States and other countries were examining whether extremist groups may be inciting protesters to riot around the world over the cartoons that have been printed in numerous European papers.

“The United States and other countries are providing assistance in any manner that they can … to see if this is something larger than just a small demonstration,” Col. James Yonts told reporters when asked whether al-Qaida and the Taliban may have been involved in the violent Afghan demonstrations.

The Afghan protests have involved armed men and have been directed at foreign and Afghan government targets _ fueling suspicions there is more behind the unrest than religious sensitivities. But Yonts stressed they had no evidence to support suggestions of al-Qaida or Taliban links.

Hundreds rioted outside the U.S. military base in the southern city of Qalat on Wednesday, throwing rocks at Afghan police. Police tried to clear the crowd by firing into the air, then were forced to fire into the crowd, provincial police chief Ghulam Nabi Malakhail said.

Four people were killed and at least 20 were wounded, he said.

The protesters then set fire to three fuel tankers waiting to deliver gas to the base, Malakhail said. He said U.S. troops fired warning shots into the air.

A U.S. military spokesman, Lt. Mike Cody, said he had no details on the incident.

Eleven people have been killed in the past week as thousands have protested in a dozen Afghan cities and towns to march against the cartoons, which have been reprinted in various European media after first appearing in a Danish newspaper in September.

The drawings _ including one depicting the prophet wearing a turban shaped as a bomb _ have touched a raw nerve among Muslims. Islam is interpreted to forbid any illustrations of Muhammad for fear they could lead to idolatry.

The caricatures were first published in the Danish newspaper Jyllands-Posten. Culture editor Flemming Rose told CNN on Wednesday he came up with the idea after several local cases of self-censorship involving people fearing reprisals from Muslims.

“There was a story out there and we had to cover it,” Rose said. “We just chose to cover it in a different way, according to the principle: Don’t tell it, show it.”

Rose also said his paper was trying to contact a prominent Iranian newspaper that said it would hold a competition for cartoons on the Holocaust to test whether the West extends the principle of freedom of expression to the Nazi genocide as it did to the Muhammad caricatures.

Rose said Jyllands-Posten wants to publish those cartoons on the same day the Iranian paper Hamshahri does.

The editor of the paper said he had no plans to resign over the drawings after former Foreign Minister Uffe Ellemann-Jensen said that “when an editor-in-chief admits he made an erroneous judgment … he should quit.”

Elsewhere, about 300 Palestinians attacked an international observer mission in the West Bank city of Hebron and tried to burn one building.

Sixty members of the mission were inside, said Gunhild Forselv, spokeswoman for the Temporary International Presence in Hebron, or TIPH, which serves as a buffer between Israeli settlers and Palestinians in the volatile city.

The protesters chased away outnumbered Palestinian police stationed outside the mission, Forselv said. Reinforcements were called in to quell the disturbance.

In France, President Jacques Chirac asked media to avoid offending religious beliefs as another French newspaper reprinted the caricatures. Chirac said during a Cabinet meeting that he condemned “all obvious provocations likely to dangerously kindle passions.”

Besides reprinting the drawings, the satirical French weekly Charlie-Hebdo also printed new caricatures of its own, including one under the headline “Muhammad Overwhelmed by the Fundamentalists” that showed the prophet with his head in his hands, remarking, “It’s hard to be loved by idiots.”

Two newspapers and two television stations in New Zealand that carried the prophet drawings apologized for causing offense during a meeting with a national Islamic federation.

There were several other small protests across Afghanistan on Wednesday, including one in Kabul. Hundreds of university students, including women, marched peacefully through the capital, chanting “Death to the Danish! Death to Americans!”

More than 1,000 people also rallied Wednesday in Muslim-majority Bangladesh’s capital, burning Danish and Italian flags. There were no immediate reports of violence.

Muslims also demonstrated for the third straight day in Indian-controlled Kashmir. In Turkey, police using armored vehicles blocked some 500 ultranationalist Turks from reaching the Danish Embassy and the demonstrators dispersed peacefully.