Detectives investigating the bombing at a Londonderry police station have arrested a 53-year-old man.
Earlier police were granted a four-day extension to question another man in custody.
The 42-year-old man was arrested in Derry on Saturday in connection with the car bomb which exploded outside the Strand Road police station on Tuesday 3 August.
No-one was hurt in the explosion, which was blamed on dissident republicans.
A taxi was hijacked and packed with 200lbs of homemade explosives. The driver was ordered at gunpoint to leave the car at Strand Road police station.
An organisation calling itself Oglaigh na hEireann claimed it was behind the attack, which badly damaged a number of businesses at about 0320 BST.