The husband of murdered policewoman Sharon Beshenivsky has paid tribute to his "wonderful" wife.
Paul Beshenivsky called his wife's killers 'cowards'
Pc Beshenivsky, a mother of three children and two stepchildren, was shot when she went with a colleague to attend a robbery in Bradford on Friday.
Her husband Paul described her as "my rock" who was "loved by everyone", and branded her killers "cowards".
Five people are being questioned in West Yorkshire while a sixth remains in custody in London.
Pc Teresa Milburn, discharged from hospital on Sunday after treatment for a shoulder wound, said she had lost "a dear friend".
"Sharon and I enjoyed working together immensely. Nothing can bring Sharon back and my wholehearted sympathy goes out to her family."
On Sunday prayers were offered for Pc Beshenivsky during a memorial service at Bradford Cathedral which had been intended to commemorate the victims of the Pakistani earthquake.
Mr Beshenivsky told how Friday began as "such a happy day" as their youngest daughter Lydia celebrated her fourth birthday.
"She waited excitedly for her mum to come home. When Sharon was late I knew something was wrong," he said.
"It breaks my heart to think that I will never hear her infectious laugh again, to think she won't be here to see our children grow."
Mr Beshenivsky said: "The people who did this to Sharon and to Teresa and to our families are cowards.
"They took away my wife, but they also took away a wonderful mum and the world is a darker place without her."
His wife, who had been in the force for nine months, was proud to be in the police.
"Her enthusiasm for the role spread to us all and we supported her throughout," Mr Beshenivsky said.
"She lost her life trying to protect people and that was Sharon all over.
"She always put others first and would do anything to help someone out if they needed it."
He said support from friends, colleagues and strangers had been a comfort to his family, but asked that the family be left to grieve in peace.
During the memorial service at Bradford Cathedral, Rev Peter Whittaker said: "We register our shock and concern with the family of Sharon, a police officer killed on duty, and to Teresa, her injured colleague.
"We pray for the police and for all our communities here in the city of Bradford."
Outside the cathedral, West Yorkshire Police Deputy Chief Constable Julia Hodson, who attended the service, said: "We came here to support the earthquake appeal for Kashmir and we were very touched that they found room in the service to pay their respects to our colleagues.
"It shows a great strength in the community."