A man in his 60s has been arrested by gardaí (Irish police) investigating an explosion in Creeslough, County Donegal, in 2022.
The blast, which killed 10 people, happened at a service station in the village on 7 October 2022.
The victims – four men, three women, two teenagers and a five-year-old girl – were from the village or surrounding areas.
Gardaí said the man has been arrested for alleged offences contrary to the Non-Fatal Offences Against the Person Act 1997.
Creeslough is a small village in the north-west of Ireland, about 15 miles (24km) from Letterkenny and 30 miles (48km) from the border with Northern Ireland.
It has a population of about 400 people.
The investigation is being co-ordinated from Milford Garda station, with support from the Garda National Bureau of Criminal Investigation and other agencies.