Two men have been arrested as part of the ongoing investigation into the attempted murder of Detective Chief Inspector John Caldwell in February.
Police say the two arrests were made in Co Tyrone on Friday morning.
A 28-year-old man was arrested under Section 41 of the Terrorism Act 2000 following the search of a house in the Omagh area.
Read more: John Caldwell investigation: PSNI detective says "significant progress" being made
Meanwhile, a 70-year-old man was also arrested under Section 41 of the Terrorism Act 2000 following the search of a property in the Dungannon area.
Both men have been taken to Musgrave Serious Crime Suite for questioning, and remain in custody at this time.
There have now been 17 arrests made in connection to the ongoing investigation.
Mr Caldwell was shot several times at a sports centre in Omagh on February 22. He had been putting footballs into a car with his young son after coaching a youth sports team when he was targeted.
The senior officer, who was critically ill for some time at Altnagelvin Hospital in Derry, was left with life-changing injuries. He was discharged from hospital last month to continue his recovery at home.
On Thursday, Detective Superintendent Eamonn Corrigan, who is leading the attempted murder inquiry, said “significant progress” has been made in the investigation, but did not give any further details.
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