A Hounslow teenager, arrested as part of a London wide crackdown on gang violence, was convicted today of owning a dangerous fighting dog.

Andre Douglas, 20, of Charter Crescent, was ordered to pay £100 compensation and shell out £150 in costs, for owning the out of control animal at Feltham Magistrates’ Court this morning.

Yesterday cops from Feltham and Houslow raided the homes of 12 suspected teenage gang members and arrested an 18-year-old man and a 34-year-old man on gang-related offences.

More than 140 people were arrested across the capital for offences including robbery, serious assault and the supply of controlled drugs.

The raids came on the day a man and two youths were convicted of stabbing 16-year-old Ben Kinsella to death in Islington, north London.

Ben was stabbed 11 times after a row in a bar in June last year.

The raids mark a new phase in Operation Blunt Two, a year-long strategy to cut the number of victims of attacks.

Commander Mark Simmons, head of Operation Blunt Two, said: "We know that street gangs often play a part in violent attacks on young people.

"Individuals affiliated to gangs are cowardly, acting in packs and using weapons to target and intimidate others."

Suspects arrested during the operation have all been taken to London police stations where they remain in custody while inquiries continue.

A firearm was seized in Westminster.

Three dangerous dogs have been seized in Lambeth, Tower Hamlets and Ealing.

A range of other tactics have been deployed including the use of screening arches at transport hubs, stop and search operations and searches of open spaces.