Ronan Kerr murder - 22-year-old man released
One of the five men arrested in connection with the murder of Constable Ronan Kerr has been released.
The 22-year-old was arrested in Coalisland on Tuesday.
Earlier police investigating the murder arrested a woman. The 23-year-old was detained in Omagh on Wednesday.
Four men are still being questioned about the murder of Constable Kerr, who 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 have 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.
The latest police investigation is being led by detectives from the Serious Crime Branch.
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.