Northern Ireland Secretary Chris Heaton-Harris describes the attack on Detective Chief Inspector John Caldwell as "cowardly and callous".
The senior police officer was shot several times in front of his young son at a sports complex in County Tyrone.
The officer remains in a critical but stable condition in hospital.
Report by Patelr.
Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn
