Police have arrested four people over alleged dissident republican activity in Northern Ireland.
Three men and a woman were detained in Toome, County Antrim and Pomeroy, Carrickmore and Omagh in County Tyrone.
Houses in those areas are being searched. The three men are aged 33, 44, and 46, while the woman is 37.
They are being questioned at Antrim police station.
Police later arrested a 45-year-old man in the Cookstown area. He was taken to Antrim Serious Crime Suite for questioning.
Following a number of searches several cars were also seized.
A search in Cookstown is ongoing.