A British man who has been travelling the world in a bus powered by chip fat has been arrested in India on suspicion of terrorism, his family say.
Andy Pag, from Croydon, south London, was arrested in Ajmer, in the state of Rajasthan, in northern India.
His family said he was arrested on Tuesday after allegedly using a satellite phone without permission.
The 34-year-old campaigner has been driving a biotruck to highlight the benefits of using low carbon energy.
Since leaving London in September 2009 the campaigner has driven his truck through Europe and the Middle East before reaching India.
The Foreign and Commonwealth Office said it had not been involved in providing consular services to Mr Pag, who has dual British and Italian nationality.
It said it had not been informed of his arrest by the Indian authorities as Mr Pag had been travelling on his Italian passport.