BRITISH Transport Police want to speak to this man, pictured left, after an American tourist had his rucksack stolen from an early Penzance to Camborne train.
Officers have released CCTV images of a man they believe will have information about the theft on July 31.
PC Wayne Frost said: "The victim, a man in his fifties who was visiting from the USA, boarded the 0645hrs Penzance-London Paddington service at Penzance station on Wednesday, July 31.
"He later reported his rucksack missing. After reviewing CCTV footage, I would like to identify and speak to the man in these photographs as I believe he will have key information about the incident.
"The man in these pictures travelled on the same train and departed at Camborne station where he left the station for a while, before returning and catching the 0800hrs service to Redruth station.
"He is described as white, aged about 25, with shaved dark hair. He was wearing a white T-shirt and dark trousers."
Anyone with information should contact British Transport Police on Freefone 0800 405040 or Crimestoppers on 0800 555111, quoting B12/WWA of 29/08/2013.