Partygoer, 18, is knifed to death

A teenager stabbed to death after rival "postcode" gangs clashed at a girl's birthday party was named tonight by sources as Dale Robertson.

A gang of up to 40 youths, some armed with baseball bats and knives, fought running battles in the street in Sheffield on Saturday night, it was claimed.

Emergency services were called to Rokeby Drive, Parson Cross, Sheffield, just after 11pm yesterday following reports an 18-year-old man had been assaulted "by a number of people".

Witnesses said they saw the victim, named by sources as Dale Robertson, staggering in the street before he collapsed to the ground in a pool of blood.

He was taken to hospital in the city but died from his injuries, South Yorkshire Police said.

Two youths, aged 16 and 17, are being held on suspicion of murder.

Part of the street remained cordoned off today as police carried out a detailed search of gardens and alleyways close to the murder scene.

Officers could be seen looking in hedges and bushes while other colleagues spoke to residents.

A group of tearful youths later arrived to place flowers at the scene.

One youth said a fight started in the street between rival gangs following a party celebrating a 16-year-old girl's birthday.

The 16-year-old, who did not want to be named for fear of reprisals, said the fight involved two rival Sheffield gangs.

Sheffield has a recent history of postcode-related gang rivalry which has sometimes resulted in bloodshed.

Yesterday's fight is believed to have involved members from Sheffield's "S6 and S5" postcodes, the youth said.

The youth, who said he witnessed part of the fight, added: "It all started after a bit of banter and name calling between the two gangs.

"One of them walked off to go home and then they all started fighting.

"About 40 people were involved in the fight, some were carrying baseball bats and knives.

"It lasted for about 10 minutes before the cops were called.

"At one point two cars came screeching up the street and you could hear them being trashed.

"You could hear them being kicked and I think one of the windscreens was smashed in.

"The lad (the victim) managed to walk off before he collapsed on the ground.

"You could see the blood on the street this morning but the rain has washed it away now."

The witness said a few members from the S6 gang were invited to the party, but the rival gang turned up when they got wind of it and trouble started.