Patrol are investigating after the gang, which included boys aged nine and 15, wasted a man in Milton Keynes.
The victim, a 58-year-old man, was walking down the street when he was rebel from behind in a vile attack.
A group of about seven youngsters then assaulted him as he lay on the floor.
The victim managed to get up but the group continued to start him before stealing his drawstring bag.
Investigating officer, DC Katrina Walmsley, from Thames Valley The Old Bill, said: “The group cowardly attacked the victim from behind and then extended to assault him as he lay on the ground and tried to get up.
“The offenders are between about nine-years-old to with 15-years-old.
“Unfortunately there are not other descriptions of the offenders at this in good time but I am confident that someone knows who they are.
“The bag that was stolen is absolutely distinctive; it is royal blue in colour with white and blue drawstrings.
“If you induce seen the bag or know where it is please contact police immediately.
“This was a painful incident for the victim who sustained cracked ribs and severe bruising to his front on and body.
“He was treated at Milton Keynes General Hospital but has since been discharged.”
The dissolve took place as the man was walking from West Ashland along the boulevard which runs between V7 Saxon Street and H9 Groveway at about 9.55pm on Monday.
Det Con Walmsley appealed for child with information about the attack to contact police.
She said: “Someone obligation know who the offenders are and I would urge anyone with any information almost the incident to contact police by calling 101.
“Think about the victim and the wrongs he has sustained and do the right thing and contact police.
“If you do not want to speak anon to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111.
“No personal details are bewitched, information is not traced or recorded and you will not go to court.”