BRUSSELS, Belgium - The European Union, angered by Zimbabwe's refusal to let its observers freely monitor next month's presidential elections, imposed sanctions against the government of President Robert Mugabe yesterday and ordered its observers to come home.

At a meeting, the EU foreign ministers issued a statement saying Mugabe's government had "prevented the deployment of an EU election observation mission."

"The EU remains seriously concerned at political violence, serious violations of human rights and restrictions on the media ... which call into question the prospects for a free and fair election," the foreign ministers' statement said.

As a result, "targeted sanctions" were to be imposed, officials said.

EU spokeswoman Emma Udwin said "all 15 EU governments agreed it was preferable to withdraw all the observers" and also impose economic sanctions.

Officials said the EU would cut off $110 million in development aid for the 2002-2007 period.

In Zimbabwe, presidential spokesman George Charamba did not immediately return a call from The Associated Press seeking comment.

But Morgan Tsvangirai, the leader of the main opposition Movement for Democratic Change, discounted the EU moves.

"I don't think the European factor is any more relevant," he said in an interview with the Associated Press Television News before the EU decision.

"They (have been) talking about sanctions and not imposing any. It's too late now."

With the election less than three weeks away, "I don't think they will be able to influence anything," he said.

Mugabe, 77, is fighting for his political survival, and has imposed various restrictions on journalists and opposition parties to ensure victory. Tsvangirai is the biggest challenge to Mugabe's hold on power since he led the nation to independence from British colonial rule in 1980.

The sanctions came two days after Zimbabwe forced Pierre Schori, the head of the EU team, to leave the country. His expulsion set up a showdown with the 15-nation bloc that threatens to further isolate the south African country.

Although Schori, who attended the EU foreign ministers meeting, recommended against imposing sanctions and withdrawing observers, officials said the EU governments felt they could no longer accept Mugabe's behavior.

The EU has been warning Mugabe's government for weeks it needed to improve political freedoms and stop violence by supporters of the ruling ZANU-PF party.

In their statement, the foreign ministers made clear the EU sanctions were "designed not to harm ordinary citizens of Zimbabwe or her neighbors, nor should they prevent dialogue between the EU and Zimbabwe."

The statement added that humanitarian aid for Zimbabwe would continue.

Schori was expelled after Mugabe's government refused to recognize his credentials as head of the EU mission to observe the March 9-10 presidential elections.

Zimbabwe has said it won't accept observers from EU members Sweden, Denmark, Finland, Germany, Britain or the Netherlands. It accuses these nations of favoring his opposition.

There are currently 30 European observers in the country of a team that was supposed to number 150 eventually. Not all the observers are from EU countries; six are from Norway.

In Zimbabwe, four Christian clerics and seven of their followers were ordered to appear in court yesterday in Bulawayo on charges they violated new security laws by holding an illegal prayer vigil for peace.

Also yesterday, about 10,000 ruling party supporters marched through downtown Harare, the capital, and some stoned the building housing Tsvangirai's party. Police stopped the attack and herded at least 50 party militants into police vans. However, police refused to confirm there had been any arrests.

Church officials in Bulawayo, Zimbabwe's second largest city, said the clerics and their followers were arrested Saturday by police who claimed that under Zimbabwe's new security laws permission for the prayer vigil was denied.

Several of the group were arrested as they knelt and prayed outside a police station where the group's leader, the Rev. Noel Scott, an Anglican pastor, had been taken. Among those arrested was Father Kevin O'Doherty, an American Roman Catholic missionary from Detroit who is based in Bulawayo.

The interdenominational group of churches said in a statement police banned a prayer procession Saturday to several local churches on grounds they could not guarantee walkers' safety. The group said participants in the vigil decided to use automobiles to move between church services rather than to march on foot.