A tenth arrest has been made by police investigating the shooting of senior detective John Caldwell in Northern Ireland last month.
The 45-year-old man was arrested in the Belfast area under the Terrorism Act.
He has been taken to Musgrave serious crime suite for questioning.
Detective Chief Inspector Caldwell was shot and seriously injured at a sports complex in Omagh on 22 February.
He remains in a critical but stable condition in hospital.
A group calling itself the New IRA has claimed responsibility for the attack.
Eight men, ranging in age from 22 to 72, were also arrested in connection with the attempted murder.
All have been released following questioning.
A 25-year-old man was arrested in connection with the claim of responsibility made following the attack, but he was released following questioning at the weekend.
