A balaclava linked to the brutal gun murder of a father – whose son was also injured in the frenzied attack – was laced with the DNA of the alleged killer, a court heard.

Murder detectives found the DNA of Ricardo Dwyer, accused of opening fire on the father and son at a shop in Holloway, on one of two balaclavas found in an Adidas bag.

The DNA of two other people was also found on the clothing but could not be positively matched.

Shop workers Ahmet Paytak, 50, and his 21-year-old son, Huseyin, were shutting up Euro Wines and Food when two men pulled up on a motorbike before one stormed in and opened fire four times.

Alleged hitman Dwyer, 27, is believed to have been paid to gun down a different father and son who also worked in the Hornsey Road store in a gang “revenge” attack, but mistook the Paytaks for his targets.

Mr Paytak was shot in the stomach and died of internal injuries while his son’s thigh bone was fractured by a bullet, on March 22, 2009.

The ordered “hit” was the result of a series of violent showdowns between rival Turkish gangs involving sub machine guns, pistols, arson attempts and armed robberies, the Old Bailey heard.

A string of incidents between January 24 and March 22 in that year saw an arson attack on the Hackney Mosaic Club by the Tottenham Turks on February 18, jurors were told.

Then came an armed robbery on a taxi rank in Tottenham involving a sub-machine gun, followed by another gun attack on the E5 Social Club used by the Tottenham Turks.

Kemal Armagan – a leading figure in the Hackney Turks along with his two brothers – was injured in the spate of attacks, and is suspected of ordering the hit on Euro Wines and Food in revenge. He remains on the run and is wanted by police.

Edward Brown, prosecuting, said: “There has been a feud between the Tottenham Turks and the Hackney Turks which has resulted in many incidents of gang violence involving firearms.

“Kemal Armagan and his brothers were leading figures in the Hackney Turks gang also known as the ‘bombers’ gang.”

He added: “It was revenge, planned and quickly put into place just that evening.”

None of the weapons used in the string of showdowns has been linked to the Euro Wines and Food incident.

The court also heard a number of calls from mobiles between Michael James – who has already been convicted of murder over the attack for being the accomplice waiting outside on the motorbike – were made between him, Dwyer and Armagan the night of the attack.

Dwyer denies charges of murder and attempted murder. The trial continues.