Four people who were arrested over an IRA bombing in 1972 have been released without charge, police have said.
Nine people were killed in the no-warning bomb
Nine people, including three children, were killed when three car bombs exploded in Claudy, County Londonderry.
Sinn Fein assembly member Francie Brolly and freelance sports commentator Seamus Mullan had been detained along with another man and a woman.
Mitchel McLaughlin, Sinn Fein, described the arrest of Mr Brolly as "a political stunt".
"There are many, many questions which have to be asked about the PSNI activity and motivation," he said.
"The nature of the interrogations, I understand, will quite clearly demonstrate when the detail comes out that this was a political operation from start to finish."
The arrests were made on Tuesday morning.
A 58-year-old woman in Dungannon was one of those arrested.
Police said two men aged 67 and 60 were detained in Dungiven, and a man, 50, was detained in the Portglenone area.
On Wednesday evening, police said that all four people had been freed and a report was being prepared for submission to the Public Prosecution Service.
Mr Brolly is an assembly member for the East Londonderry constituency.
Seamus Mullan is a freelance journalist who reports on Gaelic games for a number of media outlets, including BBC Northern Ireland.
In December 2002, the police said a priest, who had died, was involved in the Claudy bombing.
It also emerged that both the Catholic Church's cardinal at the time, William Conway, and the then Secretary of State, William Whitelaw, met to discuss the matter.