Police are appealing for witnesses on the first anniversary of the murder of a Wembley man.

A £20,000 reward is being offered for information which leads to the arrest and prosecution of anyone responsible for the murder of Omer Jama Abdi in Wembley in February 2012.

On February 14 2012, at about 2.20am, officers were called to help Mr Abdi, who had been injured in an assault in St John’s Road.

Paramedics were called and the victim was taken to Northwick Park Hospital where he was pronounced dead.

It is believed the Somali nation was involved in an argument with two men, described as being of Somali appearance, outside an address in St John’s Road.

An initial post mortem did not establish the cause of Mr Abdi’s death but further tests revealed that he died of heart disease, aggravated by the assault.

On 15 February 2012, detectives released an image of a man they wish to speak to in connection with the investigation He is believed to be in his mid-30s and Somali in appearance.

He has never been identified or contacted police and officers are continuing to appeal for information about him.

On 15 March 2012, officers issued an image of a vehicle they wish to trace.

The silver three-door Vauxhall Corsa was seen leaving Elm Road shortly after the murder in nearby St John’s Road.

Officers are now releasing CCTV footage of this car and another, a dark-coloured Vauxhall Astra.

Officers wish to speak to the drivers and any passengers of these vehicles in connection with the investigation.

Detective Inspector Jamie Stevenson, who is leading the investigation for the Homicide and Serious Crime Command (HSCC), said: "It is now one year on since Omer died and his family is still no nearer to seeing those responsible brought to justice.

"There are a number of people we wish to identify and trace so we can speak to them about Omer's death and we hope the people will recognise themselves on the CCTV footage and images and call us.

"We are also still keen to hear from anyone who knew Omer who hasn't spoken to police and can help us identify anyone that he may have had any altercations with.

"I hope that following this passage of time that there are people still out there that have information on what happened on the night of his death that now feel they can come forward and share this with police.

"I am also asking the Somali community to have confidence in the Met, and that any information that they have for us will be treated in the strictest of confidence. If preferable we have Somali speakers on hand to talk to anyone with information."

Anyone with information is asked to call the incident room on 020 8358 0200 or, for a dedicated Somali speaking line, dial 020 8358 1241.

If you wish to remain anonymous, call Crimestoppers on 0800 555 111.