The Garda and the PSNI have appealed for witnesses to separate crashes in which one person has died.
Police in Northern Ireland confirmed a man died when the silver-coloured, Volvo car he was driving struck a tanker lorry on Glenshane Road, between Dungiven and Maghera on Monday morning shortly before 5.20am.
Emergency services attended the scene where the driver of the Volvo was pronounced dead. The driver of the tanker lorry was taken to hospital for treatment of what are not believed to be serious injuries.
Glenshane Road remains closed between Main Street on Dungiven and the Tobermore Road/Glenshane Road junction, and a number of diversions are in place as officers conduct enquiries at the scene of the collision.
Anyone who witnessed the collision, or who may have captured it on a dashboard camera or who witnessed the collision and has not yet spoken to police, is asked to call officers on (Northern Ireland) 101, quoting reference 233 of 09/08/21.
In Co Cork, members of the Garda have appealed for witnesses to a single vehicle crash that occurred at approximately 8.10pm on Sunday, at Hadwell, Lower Aghada, Co Cork.
The driver and only occupant of the vehicle involved, a man aged in his late 20s, was taken to Cork University Hospital with serious injuries.
The road was closed for a period of time for technical examination but has since reopened fully to the public.
Gardaí at Midleton are appealing for any witnesses to this collision to come forward. Gardaí are also appealing to any road users who may have camera footage (including dash-cam) and were travelling in the Hadwell area between the hours of 8pm and 8.30pm to make this footage available.
Anyone with information is asked to contact Midleton Garda station on 021 4621550, the Garda Confidential Line on 1800 666 111, or any Garda station.