John Caldwell: Eleven arrested over shooting of police officer
Eleven people have been arrested in County Tyrone over the attempted murder of senior detective John Caldwell.
Police have also released new CCTV footage and photographs of vehicles they believe were used in the attack.
Det Ch Insp Caldwell was shot while putting footballs into his car at a sports complex in Omagh on 22 February.
Police said nine men and two women, aged between 21 and 72, were detained under the Terrorism Act on Friday morning.
Det Ch Supt Eamonn Corrigan said the search and arrest operation in Omagh and Coalisland in County Tyrone marked a "significant development" in the investigation.
The shooting, which happened in front of school children, was widely condemned by political figures across Northern Ireland and beyond.
On Friday, police said three vehicles they believed were used by the gunmen were spotted travelling in convoy on the Drumnakilly Road in the direction of Omagh in the hours before the attack.
Seven of those arrested on Friday had been previously detained in relation to the shooting, Mr Corrigan added.
Police have previously said two Ford Fiesta cars they believe were used in the attack had been bought in Ballyclare and Glengormley in County Antrim in the weeks before the attack.
They were later found destroyed after the shooting.
Detectives have since identified a third vehicle, a black Mercedes Benz C-Class, which they believed was used as an operational vehicle both before and immediately after the attack.
Newly released CCTV footage shows all three vehicles in convoy on the Drumnakilly Road in the direction of Omagh in the hours before the attack.
Detectives have said an estimated 400,000 hours of CCTV footage has been seized for analysis in the hunt for those involved in the shooting.