A man in his 20s was arrested.
A man in his 60s is in critical condition in hospital after an assault in Mayo.
The incident happened after an altercation at around1.20am on High Street in Westport.
A man in his 20s was arrested at the scene and is being held at a North West Garda Station.
The scene has been preserved for a technical examination and Gardaí are appealing for witnesses.

Exclusive: Cllr Bill Clear To Join Independent Ireland After Months Of Discussions
WATCH: Car Linked To Attempted Naas Robbery Spotted In Newcastle - Gardaí Warn Public Not To Approach
Court Hears Gardaí Medically Advised Not To Speak To Alleged 10-Year-Old Victim Of Sexual Assault At Citywest
A New Report Has Highlighted Persistent Gaps In Access To Beds In Stroke Units
Department Of Housing Shifts Blame On To Council As Kildare Families Priced Out Of "Affordable" Housing Again
Outbreak Of Bird Flu Has Been Confirmed In Carlow Turkey Flock
Lidl To Open Country’s First Net Zero Energy Store In Maynooth This Thursday
Contract For Maynooth Eastern Ring Road Project Awarded To Company Based In Kilcullen