A 21-year-old man arrested after footage was posted on the YouTube website of two boys being goaded into fighting each other has escaped with a police caution.

The man, who has not been named, answered bail in Crawley, West Sussex, after being held by police in March on suspicion of aiding and abetting an assault.

His arrest came after images were published of two 12-year-old boys trading punches, kicks and headbutts as a man filming the attack encouraged them.

Police said the two boys have since been identified and are said to be safe and well.

In the footage, the amateur film-maker is heard sniggering behind the camera as the pair fight.

During one section, one of the boys looks into the camera and asks: "Kicking is allowed, isn't it?"

And one of the boys shouts "He's crying" after punching the second child in the face.

The video, entitled Lethal Fight (Crawley), is believed to have been shot in a bedroom in Crawley and posted on YouTube in March.

A second video, called Lethal Fight 2, was also posted on the video-sharing website and is believed to involve the same two boys fighting in the same bedroom.

Sussex Police were alerted to the videos, which have since been removed from YouTube, by The Argus, which offered a £1,000 reward for a successful prosecution.

A police spokesman said that a 21-year-old man who answered bail today was cautioned for aiding and abetting a common assault following advice from the Crown Prosecution Service