Anti Austerity Alliance TD Paul Murphy has accused the gardaí of "political policing" following his release from Garda custody.

Deputy Murphy has been released after nearly nine hours of questioning over the alleged false imprisonment of Tánaiste Joan Burton in Jobstown last year.

Three other men were also arrested in connection with the incident. Two of them have also since been released without charge.

A file is being prepared for the DPP.

The Dublin south-west TD was arrested at his home this morning in connection with a November protest in Jobstown.

Joan Burton was invited to attend a graduation ceremony at An Cosan on the Cloonmore Road, and was trapped in her car for over two hours.

Socialist TD Ruth Coppinger says today's arrests were unjust, and are mobilising more people against the water charge.

While Joe Higgins says the arrest is a clear attempt to smear the anti-water charges movement.

Mr Murphy, TD for Dublin south-west, was being held at Terenure garda station on the south side of Dublin.

Mr Murphy's partner, Farah Mokhtarzadeh, told the Pat Kenny Show here on Newstalk that the TD did not breach Ms Burton's human rights.

People Before Profit TD Richard Boyd-Barrett also told the Pat Kenny Show it is outrageous that Deputy Murphy was not phoned and asked to attend the garda station, rather than being arrested at his home.

But the Agriculture Minister Simon Coveney is denying the arrest was politically motivated. He says his detention is simply the gardaí doing their jobs.

At the time of the protest, Ms Burton said she was slightly injured in the incident but "was straight back to work."

"I got a bad bang on the back of my neck. I was more concerned for the graduates who were dressed up in their gowns. They were their celebrating a big achievement," she said.

Speaking last November, Mr Murphy said he had "nothing to apologise for" over the protest.

Watch archive footage of the protest below: