Police searching for the killers of Pc Sharon Beshenivsky in Bradford last month have arrested one of the men they had previously named as suspects.
West Yorkshire Police said Muzzaker Imtiaz Shah, 24, was one of two men held after an armed operation in Newport, south Wales, on Monday.
They said the search for another named suspect, Mustaf Jama, 25, continues.
Gwent Police said the two arrested men, aged 23 and 24, would be taken to West Yorkshire for questioning.
Det Supt Andy Brennan of West Yorkshire Police said: "Officers are still keen to trace 25-year-old, Mustaf Jama, and urge him to contact the police as a matter of urgency."
His brother, Yusuf Jama, 19, has already appeared in court charged with Pc Beshenivsky's murder.
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