Chad's security forces have claimed to have killed more than 60 people loyal to a Muslim spiritual leader in clashes in the town of Kouno, around 300km south east of the capital Ndjamena.

Government soldiers fought with the followers of Ahmat Ismael Bichara, a "marabout" or holy man, who had allegedly threatened a "holy war" in the country.

"I'm sorry to say that there were 66 dead and 51 seriously wounded [among Bichara's followers]," Ahmat Mahamat Bachir, Chad's security minister, said.

"It's a regrettable toll, but we think we now control of the situation caused by the actions carried out by these terrorists, these extremists," Bachir said.

He said that four members of the Chadian security forces were killed and six wounded in the fighting, which took place on Sunday and Monday.

Chad's government says Bichara had threatened to fight against the corruption of the Islamic faith in Chad, which is a secular state but counts just over half of its population as Muslims.

Fighting broke out when government troops tried to break up a group listening to one of Bichara's sermons, the AFP news agency reported.

Bichara's followers had been armed with swords, spears and bows, according to officials.

Chad has suffered waves of violence over the last few years, including inter-ethnic clashes, as well as raids over the eastern border from Sudan by Janjawid fighters, and successive attacks by anti-government groups.