A humanitarian volunteer from Ireland who was earlier this year arrested on suspicion of human trafficking in Greece has arrived back home on bail.

Sean Binder (24) of Doughcloyne, Togher, Co Cork, arrived at Dublin Airport today where he was met by his mother Fanny and a group of friends.

He travelled to Lesbos a year ago to assist refugees caught up in the humanitarian crisis in the Mediterranean.

The Trinity College Dublin and London School of Economics graduate said he is looking forward to Christmas but he added that the battle to prove his innocence is not over. 

Mr Binder decided to volunteer in Greece a year ago in order to get some hands-on experience having been involved through his studies in human rights and crisis in conflict areas. 

His arrest and detention, along with three other NGO volunteers, was unexpected. Mr Binder said that he had never experienced any hostility in Lesbos where he was carrying out humanitarian work with Emergency Response Centre International. 

The international relations graduate said he was baffled by his arrest.

"It is as if we did something criminal but I don't understand how it can be problematic or questionable to pull somebody who is drowning out of the water or to make sure that an elderly lady or man doesn't die of hypothermic shock. We were providing basic medical assistance," he said.

Mr Binder met with police in a voluntary capacity in August after being informed that he was a person of interest in relation to alleged criminal activities.

He and the three other NGO volunteers have spent the last three months in a Greek jail after they were accused of helping illegal migrants enter the country. 

Amnesty International in Ireland has said that they welcome the release of Mr Binder and his co-accused. However, they insist that smuggling charges against the humanitarian workers must be dropped.

In a statement they stressed that this this case "is the latest example of how authorities are misusing anti-smuggling laws to target activists.

Kondylia Gougou, Amnesty International’s Greece Researcher, said the fact that the volunteer workers "still face absurd charges and potentially long prison sentences is an outrage".

The volunteers are charged by the Greek authorities of several crimes, including being members of a criminal organisation, espionage, as well as facilitating the smuggling of migrants. A date has yet to be set for the trial.