Ronan Kerr murder: four men released
Four men arrested in connection with the murder of Constable Ronan Kerr have been released.
It follows the earlier release of a 22-year-old man arrested in Coalisland on Tuesday in connection with the killing.
A 23-year-old woman arrested in Omagh on Wednesday in connection with the murder remains in custody.
Constable Kerr was killed by a car bomb outside his home in Omagh on 2 April.
The men were arrested on Tuesday during a series of raids involving 200 officers across three counties.
Police said they had taken away clothing, mobile phones, computers and cars for forensic analysis.
Seven searches were carried out in Coalisland, Toomebridge, Bellaghy and Ballyronan.
The five men, aged from 22 to 46, were arrested under the Terrorism Act.
A £50,000 reward remains on offer for information leading to the arrest and conviction of those responsible for Constable Kerr's murder.
Constable Kerr, who joined the police in May 2010, was the second officer to have been killed since the Royal Ulster Constabulary became the PSNI in 2001.
Dissident republicans were blamed for the murder.