Police investigating the murder of Ronan Kerr have been granted a further six days to question a 26-year-old man and a 40-year-old man.
Constable Kerr was killed by a bomb under his car outside his Omagh home.
26-year-old Brian Carron from the Dungannon area, was arrested in Scotland on 6 April and the 40-year-old man was detained near Omagh on 7 April.
Police were earlier granted a five-day extension to question a 33-year-old man arrested in the Omagh area last week.
Weapons and explosives, including four Kalashnikov rifles were found in the Coalisland area of County Tyrone on 5 April by police investigating the police officer's murder.