Members of the Emergency Response Unit stationed in Kildare are on standby to assist in an operation in Tallaght involving an armed man.
It's understood a domestic dispute broke out at a housing estate at around 5am.
Two carjackings were then carried out in Jobstown and a car was also stolen in a third incident.
Gardai are now looking for a man who they believe is driving a black Renault Kadjar with the registration 162 D 8767.
He is described as a white man of medium build and is wearing grey shorts and a black and green jacket.
Stephen Breen is Crime Editor at The Irish Sun; he's been speaking to Kildare Today.
The public are asked not to approach the man, but should contact Gardaí at Tallaght Garda Station on 01 666 6000 or the emergency numbers 999 or 112.