A young man who was having a heart attack in a Stevenage town centre underpass had his mobile phone stolen by a passer-by, police have revealed today.

The crime took place in an underpass off St George’s Way, close to the town’s museum, at around 3.30pm on Saturday, October 25, but investigators have just released a CCTV image of a man they want to talk to in connection with the incident.

The 27-year-old man was sitting on the pathway because he felt unwell - at the time he had no idea he was having a heart attack.

But he was approached by a man who police say was wearing distinctive clothing, who then stole his a black and white iPhone 4s phone before running off in the direction of Penn Way.

The victim tried to give chase but collapsed. He was taken to hospital and is expected to make a full recovery.

Assistant investigator Karen Brown said: “Although the images are not of the best quality, the clothing the man is wearing is quite distinctive and we hope this will help identify him as he may be able to assist us with our enquiries. If you recognise this man please contact me as soon as possible.”

Anyone who recognises the man, or has any other information in relation to the incident, should contact Karen Brown via the police non-emergency number 101 or call Crimestoppers anonymously on 0800 555 111.