THE MAN wanted for the murder of a West Yorkshire policewoman may have fled the UK wearing his sister's clothes and a veil.

The claim came today as police pledged to track down Mustaf Jamma - prime suspect for the mruder of Pc Sharon Beshenivsky.

Britain's border controls were condemned as "non-existent" after it was claimed that the suspected murderer fled the country by disguising himself as a veiled Muslim woman.

Police reportedly believe that Mustaf Jamma used his sister's passport and wore a full niqab to evade checks at Heathrow airport.

Shadow Home Secretary David Davis insisted there should be an urgent inquiry.

At the time of the 26-year-old's apparent escape between Christmas Day last year and New Year's Day, he was one of the UK's most wanted men and the airport was on high alert in the wake of the July 7 bombing attacks.

But it is thought that staff rarely ask those departing Britain to remove veils in order to make sure their identification is valid.

A BAA Heathrow spokesman said: "Immigration control staff always do a visual check on people coming into the country but only random checks are made with outgoing passengers."

Shadow Home Secretary David Davis today insisted an urgent inquiry was needed into the breach.

"The idea that under any circumstances you could be let through passport control wearing a veil is barely credible," he said.

"Doing so when an All Persons Bulletin for murder has been issued demonstrates that our borders are not just porous but non-existent."

Detectives have vowed to catch both Jamma, who is thought to be in Somalia, and Piran Ditta Khan, who is also on the run.

Pc Beshenivsky was shot and killed on November 18 last year as she arrived at the scene of the a robbery in Bradford city centre on the day of her youngest daughter's fourth birthday.

West Yorkshire's acting chief constable vowed today to catch two on-the-run gang members.

Deputy Chief Constable Julia Hodson said she was determined that Mustaf Jamma and Piran Ditta Khan will be caught.

"I am absolutely determined they will be brought to justice," she said outside Newcastle Crown Court, as the jury trying one of the defendants was discharged after failing to reach a verdict.

On Monday, Yusuf Abdillh Jamma was unanimously found guilty of Pc Beshenivsky's murder, while Faisal Razzaq and brother Hassan were convicted of her manslaughter by a majority of 10-1 in the 11th week of the trial.

The brothers were cleared of her murder after more than 20 hours of jury deliberations.

Earlier, a fifth man, 25-year-old Muzzaker Imtiaz Shah, of London, admitted murder, robbery and firearms charges.

They will be sentenced tomorrow.

But the jury failed to reach a verdict in relation to the robbery charge faced by 25-year-old Raza Ul-Haq Aslam, of Kentish Town, north London, after almost 23 hours and was discharged.

Det Chief Con Hobson paid tribute to Pc Beshenivsky. "She was just an ordinary cop doing her duty and her life was taken away from her by ruthless criminals.

"Our thoughts today are with two families mourning the loss of Sharon - her husband and five children, who won't have a wife and mother to celebrate Christmas with them this year.

"The second family is the wider police family. We still miss Sharon. This robbery that led to her death was a terrible violent crime in its own right and those who have been convicted showed no consideration for creed or gender when they undertook their criminal activities.

"We are hurt but I can't imagine what the pain and distress is like in the Beshenivsky household.

"People talked about her lively, bubbly personality and as a legacy to her we should move forward in a positive way. She really, really is a sad loss to West Yorkshire."

The trial jury was discharged after failing to reach a verdict on one court of robbery against a man already cleared of killing the Bradford policewoman.

Three men were convicted of killing the woman police officer on Monday in the 11th week of the trial at Newcastle Crown Court.

The 38-year-old Keighley mother was shot and killed on November 18 last year as she arrived at the scene of a robbery at the Universal Express travel agency in Bradford on the day of her youngest daughter's fourth birthday.

Her colleague Pc Teresa Milburn, who lives in Birstall, was also gunned down in the street as the robbers escaped with little more than £5,000.

Robert Smith QC, prosecuting, told the court Aslam would now be retried on the robbery charge.

The judge, Mr Justice Andrew Smith, thanked all the officers who worked on the inquiry, including Pc Milburn and the late Pc Beshenivsky.

Outside court, Det Supt Andy Brennan said Shah and Jamma were "absolutely ruthless" and had no respect for life. The officer in charge of the murder investigation said he did not agree with the judge's decision to clear Shah of the attempted murder of Pc Milburn.

But he added he did respect the decision. He told reporters: "We are absolutely convinced that Shah pulled the trigger."

He said it was too early to say whether any further prosecutions would follow.

He said Shah was "an incredibly dangerous individual".

He said prison was "the only place he should be and hopefully, he will be there for a very long time."

The detective said Shah was very good friends with Jamma and said both were equally dangerous.

The detective said: "Society is a safer place with both of them being in the position they are currently in."

He said the pair did not operate within the rules of normal society and carrying guns was "the norm" to them.

West Yorkshire Chief Crown Prosecutor Neil Franklin said: "While only one person pulled the trigger, all the men convicted were responsible for Pc Beshenivsky's death.

"The prosecution case demonstrated that their only concern was getting the money which they believed was held at Universal Express, and that they were prepared to use violence to obtain it.

"One of the weapons was fired during their escape, showing a willingness to use violence and their utter contempt for human life and a clear understanding that someone could be seriously injured or killed."

He added: "At this time our thoughts are with Pc Beshenivsky's family, friends and colleagues, and Pc Milburn, who has bravely returned to active duty on the streets of West Yorkshire.

"We hope they can take some small comfort from the verdicts."

November 13, 2005: Five days before the robbery and shootings, an Audi A6 registration OE52 XAV, which was a car that Hassan Rassaq had access to, was caught on the Big Fish surveillance system in Bradford.

Images of the vehicle were captured on CCTV. The police say that this car drove around the Morley Street area on that day on a reconnaissance exercise.

November 16: Muzzaker Imtiaz Shah arrives at a house at 99, Harehills Lane, Leeds.

November 17: Present at the house were Muzzaker Imtiaz Shah and Faisal Razzaq. Later Hassan Razzaq and another man arrive at the address in a black Mercedes sports car. Faisal and Hassan Rassaq, Shah and another man enjoy champagne, vodka and cola before going out to a brothel in Leeds.

Travelling up from London was Yusuf Jama and another man, in a silver, Toyota Rav 4, which was caught on CCTV at 4.27am on November 18 entering Leeds on the M621. They arrive at Harehills and go to bed.

November 18: All the defendants, along with two other suspects are now all at the Harehills Lane house.

At approximately 2pm that afternoon Shah, Yusuf Jama and another man get into the silver Rav 4, Hassan Rassaq and another man, get into the Mercedes sports car and Faisal Rassaq and another man get into a green Toyota Corolla.

Detectives worked tirelessly, over many hours, checking CCTV, both council-owned and private, from Leeds to Bradford.

When the vehicles arrived at Morley Street they drove past Universal Express travel agents and split up. Shah, Yusuf Jama and another man entered Universal Travel and committed a vicious and violent robbery. Staff managed to silently activate a panic alarm.

Moments later, at about 3.30pm, a police patrol car driven by Pc Teresa Milburn, and with Pc Sharon Beshenivsky in the passenger seat, pulled up and parked directly opposite Universal Express. The three men came out of the travel agents and one of them shot both officers.