This is an archived article that was published on sltrib.com in 2006, and information in the article may be outdated. It is provided only for personal research purposes and may not be reprinted.

KABUL, Afghanistan - International peacekeepers clashed Tuesday with Afghans protesting drawings of the Prophet Muhammad, leaving three demonstrators dead and prompting NATO to send reinforcements to a remote northern city.

Senior Afghan officials said al-Qaida and the Taliban could be exploiting anger over the cartoons to incite violence, which spread to at least six cities in a second day of bloody unrest in Afghanistan.

Demonstrations rumbled on around the Muslim world, and the political repercussions deepened, with Iran suspending all trade and economic ties with Denmark, where the drawings were first published. The Danish prime minister called the protests a global crisis and appealed for calm.

In a new turn, a prominent Iranian newspaper, Hamshahri, invited artists to enter a Holocaust cartoon competition, saying it wanted to see if freedom of expression - the banner under which many Western publications reprinted the prophet drawings - also applied to Holocaust images.

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.

Violence has escalated sharply in Afghanistan this week, and seven people have died in demonstrations during the past two days. Protests, sometimes involving armed men, have been directed at foreign and Afghan government targets - fueling suspicions there's more behind the unrest than religious sensitivities.

''It's an incredibly emotive issue. This is something that really upset Afghans,'' said Joanna Nathan, senior Afghanistan analyst at the International Crisis Group, a Brussels-based research institute. ''But it is also being used to agitate and motivate the crowds by those against the government and foreign forces'' in Afghanistan.

The heads of the U.N., European Union and the world's largest Islamic grouping appealed for calm.

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

On Tuesday, protesters armed with assault rifles and grenades attacked the NATO base in the northern city of Maymana, which is manned by peacekeepers from Norway, Finland, Latvia and Sweden, local officials said.

Sayed Aslam Ziaratia, the provincial deputy police chief, said three protesters were shot and killed by Afghan and Norwegian forces and that 22 others were wounded. However, NATO said it only fired live ammunition into the air and rubber bullets. Five Norwegian peacekeepers suffered minor injuries.

Provincial governor Mohammed Latif said he suspected al-Qaida may have had a hand in the unrest. He said two men from eastern Afghanistan were arrested during the protest and were being interrogated.

In Washington, President Bush called Danish Prime Minister Anders Fogh Rasmussen to express ''our solidarity and support.'' A Danish newspaper first printed the cartoons of Muhammad in September, and they were reprinted this month by other European papers, setting off a new round of protests.