Overseas Tibetan rights groups say a nun has set herself on fire to protest Beijing's control over the region in the latest in dozens of self-immolations by Tibetans in recent years.

London-based Free Tibet said Friday that Yeshi Khando circled a monastery and then self-immolated while calling out slogans including "Tibet needs freedom."

The Washington, D.C.-based International Campaign for Tibet also reported the immolation, but used a slightly different spelling for the nun's name.

The groups says security personnel and police used extinguishers to put out the flames and took Yeshi Khando away, and that local sources believed she died.

A woman reached at the Ganzi county government denied that any self-immolation happened on Wednesday and hung up. Calls to the county police office rang unanswered.