A jury has been sworn in for the trial of Dale Cregan - the man accused of murdering Preston-educated PC Fiona Bone and her colleague Nicola Hughes.
The panel of six men and six women were selected to try the case of Cregan and his nine co-defendants - variously charged with murder, attempted murder, firearms offences and assisting an offender.
After swearing the oath at Preston Crown Court the presiding judge, the Honorable Mr Justice Holroyd, told the jury they would soon become familiar with the case.
He said the case was likely to attract significant media attention and added the increased security measures were in place to help the jury try the case fairly.
He said: “You must not in any way hold it against any of the defendants that these sorts of arrangements are made.”
The trial is expected to last 12 weeks.
Cregan is charged with the murders of the two officers and the murders of Mark and David Short in Greater Manchester in the months before officers died. He is also charged with attempted murder and causing an explosion.
The nine other defendants face charges in relation to the deaths of Mark and David Short.
All the charges span between May 25 and September 18 last year.