Three men and a woman arrested in Derry yesterday as part of an investigation into an attack that left a Derry civil servant in a coma have been released unconditionally.
Police arrested the men - aged 22, 42 and 49 - and the woman - aged 40 - were arrested in the city yesterday (November 29) in connection with the attempted murder of Paul McCauley who was left in a coma after a sectarian attack in the Waterside area of the city more than five years ago.
A fourth man, who was arrested in the Midlands area of England and is aged 24, remains in custody.
Mr McCauley has been in a coma since he was attacked in the early hours of July 16, 2006.
He was attending a summer BBQ at the rear of a house in Chapel Road.
At 3.20am only he and two others remained when a group of up to 15 people came out of bushes and attacked them. After the assault the group made off in the direction of Irish Street.