This is the first photograph to be published of a man wanted for the murder of PC Sharon Beshenivsky.

Piran Ditta Khan was described during a trial as the architect of the armed robbery which led to the 38-year-old officer being shot dead outside a Bradford travel agency.

Khan, now 58, is one of two suspects on the run for their alleged involvement in the ill-fated raid on November 18 last year.

The second is 26-year-old Mustaf Jamma, who the Newcastle Crown Court jury was told, was one of the armed gang which robbed terrified staff at the Universal Express travel agency in Morley Street.

Both Khan and Jamma are believed to have fled the UK in the weeks after the bungled robbery which resulted in PC Beshenivsky, a mother-of-three and step mother-of-two, losing her life in the line of duty. Her colleague PC Teresa Milburn, 38, narrowly escaped death when she was shot in the shoulder.

Jamma is believed to be hiding in his native Somalia - the country he fled to seek asylum in the UK.

Piran Ditta Khan, who lived and worked in Bradford when he came to England from Pakistan at the age of 18, is thought to have fled at the beginning of this year to return to a remote village in his homeland.

The photograph obtained by the Telegraph & Argus shows Khan when he owned a restaurant in Aberdeen.

Speaking minutes after the end of the 11-week-long murder trial which resulted in two men being convicted of PC Beshenivsky's murder and two more of her manslaughter, Detective Superintendent Andy Brennan, who led the inquiry, vowed that everyone involved would be brought to justice. "The investigation does not stop here," said Det Supt Brennan, of West Yorkshire Police's homicide and major inquiry team.

"We are still trying to trace the two suspects and our inquiries are continuing. We are determined to identify and locate those two people and bring them back to the UK."

He added: "There is a grim determination to identify all those responsible and bring them to justice."

Today West Yorkshire Police confirmed the hunt for Khan and Jamma was continuing but would not give details.

A spokesman said: "There are ongoing inquiries but we cannot say anything more at this stage. This does appear to be a picture taken a number of years ago. However it is not a good likeness. The man we are seeking is now in his late 50s."

Home Office minister and Bradford South MP Gerry Sutcliffe said he would do anything he could to assist police in arresting Khan.

"I will of course do everything I can to help bring this man to justice if the police ask me for my assistance," he said.

The other armed robbers Muzzaker Imtiaz Shah, 25, and Yusuf Abdillh Jamma, 20, both received minimum 35-year jail sentences for PC Beshenivsky's murder following the trial which ended just before Christmas.

Faizal Razzaq, 25, was given a minimum 11-year sentence for her manslaughter. His brother Hassan Razzaq, 26, will be sentenced next month.

Waqas Yousaf, managing director of Universal Express, said Khan, a former customer, was reported to have turned to religion, grown a beard and be helping to rebuild a mosque in Pakistan.

He said he and his business partners first suspected he was involved in the robbery when the police came to see them shortly afterwards.

"They were asking if we knew an Uncle P Khan who used to be a customer here," said Mr Yousaf. "They took all our records and then we realised that they must think he was involved."