Another four teenagers have been arrested on suspicion of attempted murder after a 15-year-old boy was stabbed in Ewell.

The arrests came following the execution of five warrants in Chessington this morning as part of the Operation Severn investigation into the attack, which happened at 7.30pm on November 11 in the Watersedge area of Ewell.

The teenagers, all boys aged between 14 and 17, were arrested on suspicion of attempted murder. They have been released on bail until March 13 while the investigation continues.

Eleven other men, who were arrested shortly after the attack, are also on bail in connection with this incident.

Surrey Police have launched a website where people can upload images or footage of the incident. Visit http://bitly.com/OpSevern.

Crimestoppers is offering a £1,000 reward for anyone who provides information anonymously which leads to the arrest and charge of at least one person in connection with this incident. Information passed to the police will not qualify.   

Anyone with information should call the police on 101 quoting reference EP/13/4709.  

Call Crimestoppers anonymously on 0800 555 111.