The Tema Regional Police Command has arrested a second person suspected to have participated in the murder of Police Constable Micheal Kporyi.
The suspect, Razak Salifu, alias Baba, was arrested about 2 a.m. last Friday.
Mr Darkwah added that the suspect was currently on admission under police guard.
Last Monday, Constable Kporyi was gunned down by unknown assailants on the Tema-Akosombo highway.
Constable Kporyi, who was with the Tema Regional Rapid Deployment Force, was on a motorbike patrol duty when he was attacked by the assailants, who were said to be riding a motorbike too.
In a related development, the police in Tema have impounded nine motorbikes in an operation that was carried out last Thursday.
According to Mr Darkwah, intelligence gathered by the police indicated that a member of a gang, identified as Alidu, kept a fleet of motorbikes on his premises at Lebanon Zone 2, Ashaiman, which were used by the gang in its operations.
He said the police embarked on an operation to arrest the suspect and retrieve the said motorbikes, but on sighting the police, suspect Alidu fled.
However, the motorbikes which were parked in his house were impounded by the police.