Police are appealing to witnesses to a serious Grievous Bodily Harm incident on Wednesday 13th April 2011 at 6:00am on Ballards lane N3.
Two window cleaners were attacked by three male youths who were in the company of a female youth.
Two of the suspects beat one of the cleaners with aluminium poles causing both victims to require hospitalisation.
The officer in charge of the case, DC Mark Bennett said: “This attack was vicious, unprovoked and serious enough to hospitalise both the victims.
“One victim has a broken nose while the other required 8 stitches to his chin, 5 to his forehead and 5 in the back of the head as well as bruised ribs.
“While we have arrested four people who are now on bail, we need independent witnesses to come forward and provide us with their accounts.
A large number of people were seen nearby on CCTV footage who will have witnessed the attack.
Anyone with information is asked to contact the Metropolitan Police Service on 0300 123 1212 or CrimeStoppers anonymously on 0800 555 111 quoting reference number 2409021/11.