Emergency services are currently at the scene of a road traffic collision in Donegal Town.
The crash happened near Donegal Castle just before 9.30am this morning.
It's understood that one car is currently on its roof, blocking part of Tir Chonaill Street.
Details of injuries are not yet known at this stage.
Motorists are being urged to expect delays while the crash site is being cleared and to use alternative routes where possible.