Bus firms in South Yorkshire have issued a safety warning after two men were seen clinging onto the back of a moving bus in Sheffield.
The pair were captured on a mobile phone standing on the rear bumper of a TM Travel bus as it made its way along Prince of Wales Road, Darnall.
A TM Travel spokesman said the firm works with South Yorkshire Police and uses 'trojan buses' where undercover officers pose as passengers in a bid to identify troublemakers.
"We would like to say that the practice of grabbing on to or balancing on any moving vehicle is extremely dangerous," he said.
"Whilst it may seem like fun at the time for these people they are at risk of falling off and more seriously at a very high risk of being hit by other traffic as they fall off.
"We will take any reported incidents very seriously, and they will be reported to the police.
"We, alongside other bus operators in South Yorkshire, participate in local crime prevention schemes including Trojan buses. Therefore there is also a god chance offenders will also end up in trouble with the police."
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Brandon Jones, from bus operator First, said: "Historically were aware of this and made changes to our subsequent bus designs
"In terms of the safety point this is shocking and potentially fatal behaviour that must be stopped and we'll certainly highlight this to staff to make drivers aware."