A 25-year-old man was arrested in relation to the claim of responsibility made after the attempted murder of off-duty detective John Caldwell, as well as a security hoax last month, the Police Service of Northern Ireland (PSNI) said on Saturday.
Caldwell, detective chief inspector (DCI) at the PSNI, was gunned down in front of his teenage son at a sports complex in Omagh, County Tyrone, on Feb. 22.
