A Tibet activist who went missing from a New Delhi-bound train on September 11 returned to Mumbai on Wednesday.

The national coordinator of the Friends of Tibet, C A Kallianpur, boarded a train from Mumbai but did not reach Delhi, where he was supposed to organise a conference on 'India's Foreign Policy on China' at the India International Centre on September 13.

"He said he was drugged and robbed of all his belongings. He was dazed for many days due to the effect of the drugs," Tenzin Tsundue, an activist from the Friends of Tibet organisation, said.

Kallianpur's mobile, which was traced to Jaipur Circle in Rajasthan, was earlier recovered from one Jeetendra, a young boy in Kishenganj village, near Alwar in Rajasthan.

The handset was gifted by his father Kailash Chand who happened to be travelling on the same train on September 11. On questioning, Chand reportedly said he found the phone lying under a seat in the compartment in which he travelled from 11:00 pm, September 11 and got down at Mathura Junction at 7:00 am the following day.

The organisation alleged Kallianpur's disappearance is the second time in recent weeks that an activist has been the victim of unknown assailants.

On August 24, Greenpeace and Friends of Tibet campaigner V J Jose was allegedly drugged on a train while returning from New Delhi to Kerala [Images]. He was found unconscious at the Jhansi railway station in Madhya Pradesh and there were marks on his feet indicating that he had been beaten severely.