New Delhi (CNN) Authorities in Nepal raided one of the ashrams of a spiritual leader -- whose supporters believe he is the reincarnation of Buddha -- while investigating the disappearance of four of his followers.

Uma Prasad Chaturvedi, a spokesman for Nepal's Central Investigation Bureau (CIB), said police began searching the ashram, a type of spiritual monastery, north of the capital, Kathmandu, after getting a tip that a body was buried there.

The police search of the premises failed to uncover any human remains.

The four people missing, two men and two women, worshipped at other ashrams associated with Ram Bahadur Bomjan, according to Chaturvedi. Their families have not heard from them in more than two years, he said.

"We don't have complaints specifically against Bomjan," Charurvedi said. "Since these missing people are missing from his ashram, we may have to question him eventually. But we haven't done that just yet."

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