A pensioner has been arrested in Pakistan in connection with the murder of a Bradford police officer in 2005.
Mother-of-three PC Sharon Beshenivsky was shot dead when she and a colleague responded to an armed robbery.
West Yorkshire Police said Piran Ditta Khan, 71, was arrested on Tuesday in Pakistan in connection with her murder.
The force said he appeared at court in Islamabad on Wednesday where his extradition was discussed.
He was remanded in custody to next appear at court on January 29.
Detective Superintendent Mark Swift said: “I would like to thank the National Crime Agency officers in Pakistan and partners who have made this arrest possible.
“This is a major development in this long-running investigation and their assistance in this matter cannot be understated.
“We are continuing to liaise with partners in Pakistan to process Khan’s extradition with the intention of returning him to the UK to face court proceedings.”