Terrified Hanworth residents made over 20 calls to police after violence between gangs of 'feral' youths erupted outside shops in Market Parade.
Residents near Mount Superstore say the shop is becoming a magnet for brawls - the late-night off licence serves alcohol until 2am and the trouble took place on its forecourt.
But the shop owner, who refused to be named, said his only involvement had been to allow three desperate youths to shelter in his store - "I am 100 per cent certain I saved their lives," he said.
Calls started pouring in at 1.30am on Sunday when two groups of youths armed with knives and a stun gun clashed in the quiet street just off Hampton Road West.
Det Insp Jeff Minns said: "These youngsters were completely out of control. As well as using knives and a stun gun they were ripping posts out of the ground to batter one another."
Three youngsters in their teens and early 20s were taken into custody and later bailed following the violence on May 31 and police are now planning to make several more arrests.
One youngster was left with a bad knife wound to the head, and two others suffered a broken hand and fractured fingers.
Anyone with information should call Hounslow CID on 020 8247 6160 or Crimestoppers anonymously on 0800 555 111.