Police investigating the murder of Pc Sharon Beshenivsky arrested two people in Birmingham in connection with firearms offences yesterday.
West Yorkshire Police said detectives carried out a number of search warrants in the Birmingham area as a result of ongoing inquiries into the shooting of the 38-year-old officer in Bradford on November 18.
The force said it is continuing to search for 25-year-old Mustaf Jama in connection with the shooting.
A force spokeswoman said the raids were carried out in conjunction with West Midlands Police.
She said last night: "This morning, officers from West Yorkshire and West Midlands police executed a number of search warrants in the Birmingham area.
"The operation is as a result of ongoing inquiries following the murder of Pc Sharon Beshenivsky and shooting of Pc Teresa Milburn and the robbery at the Universal Express travel agents in Morley Street, in Bradford, on November 18.
"Two people have been arrested in connection with firearms offences in the West Midlands and are being held there for questioning."
Hundreds of people turned out for Pc Beshenivsky's funeral in Bradford on Wednesday.
The officer, who left three children and two stepchildren, had been in the job for only seven months when she was gunned down with her colleague Pc Milburn as they responded to a routine alarm.
Pc Milburn was seriously injured in the incident but was well enough to walk behind her colleague's coffin.
A nationwide hunt has been launched for Jama, who is thought to have connections with Sheffield, Leicester, Coventry and Birmingham.
Two men have appeared in court charged with Pc Beshenivsky's murder and are remanded in custody. ..SUPL: