Post-mortem examinations are to be carried out later on the bodies of five teenage boys killed when their car being driven the wrong way down a motorway in County Kildare collided head-on with another car.

Three women, two aged in their 30s and one in her 20s, and a child who were in the second car were taken to hospital with serious injuries.

The crash happened between junction 3 and junction 4 of the M9 motorway, at Moone, at about 03:00 local time on Sunday.

The vehicle the teenage boys were in was travelling southbound on the northbound carriageway when it hit the second car.

Gardaí (Irish police) have said no pursuit was taking place before the collision occurred.

The Republic of Ireland’s police ombudsman, Fiosrú is carrying out its own investigation into the crash.

Police have appealed for witnesses to the crash or anyone driving on that stretch of the motorway at the time to contact them.

Forensic investigators have completed their examination of the scene.

Garda Commissioner Justin Kelly described those injured in the crash as “family members” who were “travelling innocently” when they were struck by the car driving on the wrong side of the motorway.

He described it as a “horrific incident” and “irresponsible and dangerous driving”.

“What makes this reckless behaviour even more appalling is that in some cases it is being done for social media likes regardless of the potentially devastating impact it might have on innocent people and themselves.”

Kelly added that police “do what they can to stop such vehicles while also taking into consideration all other road users”.

“Gardaí are put in a really challenging situation dealing with such incidents.”

Councillor Ivan Keatley, of Fine Gael, said he understood the alarm was raised by a motorist who “came upon the horrific scene” and said the emergency services had attended “almost immediately”.

“The scene itself was visible from the local motorway bridge and it was very obvious from the scene of the accident that it was very, very serious,” he told BBC NI’s Good Morning Ulster programme.

“Horrific is the only way that could describe the condition that the two cars were left in.”

He said he believed the family in the second car were on the way to the airport to go on holiday.

“It’s a real sense, I suppose initially of shock and absolutely of disbelief.

“But I think since that, that has grown into an almost sense of anger that this could be allowed to happen.”

He added: “Obviously our thoughts and prayers are with the families of the victims and we are all hoping that the other injured parties can pull through.”

Sinn Féin TD for Kildare South Shónagh Ní Raghallaigh described the scenes as “absolutely catastrophic”.

“This loss of life is colossal and the effect those losses will have on their friends and families is incalculable,” Ms Ní Raghallaigh added.