Two people have been killed and two others seriously injured in a road crash in Co Longford.

The single-vehicle crash happened on the Longford to Kenagh Road at Craane, near Ballymacormack, at 12.30am.

Two men died in the crash, while a 24-year-old woman is in a critical condition in Mullingar General Hospital. 

The two men have been named locally as Tom Kearney, 24, from Ardagh and Gavin Doyle, 22, from Kenagh.

Another man was discharged from hospital this morning.

Gardaí are appealing for any witnesses to the incident to come forward.

They have warned motorists about the dangers of flash floods and inclement summer weather patterns after the crash.

Inspector Paul Cuttle said the circumstances behind the crash are still being investigated, but urged motorists to take greater care while travelling.

Gardaí say 89 people have been killed so far this year on the country's roads, which is an increase of eight deaths compared to the same period last year.

The Road Safety Authority has said the latest monthly increase in the number of people being killed on the nation's roads is a cause for serious concern.

Elsewhere, a man has died in a crash in the Camlough Road area of Co Down.

It is understood the man, who was in his 20s, was struck by a truck just before 8am.