BUJUMBURA, Burundi (AP) _ Burundi's new president, installed by a military coup last week, shifted his attention Monday from trying to muster support at home to trying to persuade international leaders to back his government.

But even as Pierre Buyoya, a Tutsi, insisted last week's bloodless coup would prevent widely feared genocide, civilians reported Burundi's Tutsi-led army had killed dozens of Hutus to avenge a rebel attack on a coffee plantation.

Lt. Col. Longin Minani, a military spokesman, initially confirmed that the army killed about 30 Hutus in the retaliatory attack. He later said the information was unconfirmed and that he was waiting for more details.

Buyoya invited foreign diplomats Monday to a hotel in the capital, Bujumbura, to tell them they should accept Burundi's forced change of government because it would prevent Hutu-Tutsi violence.

``The international community has warned against genocide in Burundi, and it was to stop this from happening that I accepted this responsibility,'' the 46-year-old military leader said. ``You have to understand that we could not let the situation deteriorate further.''

The international community has condemned the coup, and no country has recognized Buyoya (pronounced boo-YO-yah) as the new president of Burundi. The United States has said it will not accept any government that comes to power by force or intimidation.

The U.N. Security Council called on the coup leaders Monday to restore the constitutional government, and urged all sides to refrain from actions that might provoke ethnic warfare.

U.S. Ambassador Morris Hughes said Buyoya's briefing Monday was reassuring, but he declined to speculate whether Washington would reverse its refusal to recognize the coup leadership.

``We all want the same thing, peace and security in Burundi,'' Hughes said.

French Ambassador Jean-Pierre Lajaunie was equally noncommittal, saying Paris was ``waiting to see the evolution of the situation.'' But he expressed concern for deposed President Sylvestre Ntibantunganya (pronounced en-tee-bahn-toon-gan-yah), who took refuge at the U.S. Embassy on July 23, and for 18 other Hutu politicians holed up at the German Embassy.

Supporters of the coup that ousted Burundi's weak, ethnically mixed coalition government contend Buyoya, as a Tutsi and a retired army major, will be able to control the army and police.

Critics note the 1988 bloodshed under Buyoya's previous leadership, when the army killed 15,000 Hutus, mostly civilians.

Since late 1993, after Buyoya left office the first time, at least 150,000 people have died as Hutus took up arms against Tutsi soldiers and Tutsi extremist militiamen.

Hutus are in the majority _ 85 percent of Burundi's 6 million people _ but Tutsis historically have controlled the military and, therefore, the country. Burundi is 14 percent Tutsi.

Nearly a week after the coup, the capital remained calm Monday and only lightly patrolled by soldiers. University students returned to their classes after a two-week strike to protest the government.

Buyoya said his government was getting fed up with Hutu dissidents, saying the ministers who took refuge in the American and German embassies were ``using these embassies to send messages to the Burundi population, telling people to resist the change.''

``These ministers should realize that we will not tolerate such actions,'' he said.

While Ntibantunganya, a Hutu, was at odds with the Tutsi-dominated military, Buyoya has said he can restore discipline in the army because the 20,000 troops trust him.

Nevertheless, Hutu civilians told Western reporters that at least 50 people, and as many as 150, were killed by Tutsi troops Saturday to avenge a Hutu rebel attack on a coffee factory in central Gitega province. The journalists saw no graves or corpses, and no other details were immediately available.

Minani initially told The Associated Press the Tutsi troops retaliated for the attack on the coffee facility by killing ``a few Hutu rebels.'' Asked how many a few was, the military spokesman said: ``Thirty. That's a few because there were a lot of them.''

Charles Kaburahe, a director of the state-run coffee company, said the rebels burned a small coffee factory in Giheta, seven miles west of Gitega. ``Three tons of coffee were destroyed and some electronic equipment was stolen, but no employees were hurt,'' he said.

Hutu rebels have frequently targeted coffee and tea plantations _ which bring in the most foreign currency in Burundi _ crippling the country's economy.