Samples have been taken from bars and clubs on the island of Ios as part of an investigation into whether drinks were spiked before two Dublin Leaving Cert students tragically died.

The investigation is routine – with no current evidence to suggest drink-spiking was a factor.

Postmortems have now been completed on the bodies of 18-year-olds Max Wall and Andrew O’Donnell, who died on the Greek island last weekend.

Their remains are now expected to be repatriated to Ireland later today.

Many of their classmates and teenagers from other Dublin schools have already cut their holidays short and returned home, with more due back in the coming days.

Harbor of Ios island in Greece during sundown

On The Pat Kenny Show this morning, Athens-based journalist Damian Mac Con Uladh said toxicology reports are not expected for another week or 10 days.

“I spoke to a prosecutor earlier this morning on the nearby island of Naxos and she has ordered a preliminary investigation as to whether adulterated alcohol could have played a role in the deaths,” he said.

“She stressed that she doesn’t have any evidence that this was the case; there is no evidence from the postmortems that his was a case.

“She underlined that this is a routine procedure after deaths of that nature where alcohol could have played a role.

“There then is an investigation as to whether the alcohol consumed may have been adulterated.

“That investigation has been ordered and samples were taken from bars and clubs on the island of Ios and they have been sent to a chemical laboratory for analysis.”

Greece, Cyclades, Ios island, church near Chora

Mr Mac Con Uladh said the reports should not delay the repatriation of the boy’s remains – and they are expected to be returned this evening.

He said a book of condolence remains open at St Michael’s College in Dublin where the boys recently completed their Leaving Cert exams.

Max and Andrew died in separate incidents on the Greek island this weekend in an “inconceivable tragedy” for the school and local community.

Andrew’s body was discovered on Sunday morning in a rocky area near the island’s main town.

He had been reported missing by a friend who got separated from him while walking home the previous night and was found following an intensive search in the area.

It is believed he may have fallen on his way home.

Later on Sunday, having been involved in the search for his friend, Max Wall became ill near the port area of the island.

He was rushed to hospital, where he subsequently passed away.

Parents' representatives flew out to the island alongside a rep from the Department of Foreign Affairs earlier this week.

Greek police have opened investigations into the deaths.