Five men are questioned over Ronan Kerr murder

Five men have been arrested and a major search operation is under way across Northern Ireland over the murder of police officer Ronan Kerr.

The 25-year-old Catholic policeman was killed when a bomb exploded under his car in Omagh on 2 April.

About 200 officers are currently involved in seven searches in Coalisland, Toomebridge, Bellaghy and Ballyronan.