Dublin Fire Brigade and Gardai are at the scene.
Drivers are being advised to expect tailbacks and traffic delays on the N7 Naas Road at the J4 Rathcoole outbound.
The N7 westbound is closed between Junctions 4 and 5.
It follows reports of a collision that happened at 9.10am this morning.
Dublin Fire Brigade and Gardai are at the scene.
A garda spokesperson said the road is currently closed and local diversions are in place.
"Updates to follow. Investigations are ongoing," they said.


More Voters Turning Out In Kildare North Than In The South Of The County
Kildare Sparkles In Tidy Towns Competition With 11 Gold Medals Awarded
One Ban, All Banned: EU To Enforce Bloc-Wide Driving Disqualifications
Turnout Remains Around 12% At Kildare Polling Stations
Kildare Tenant Awarded €23,000 After Landlords Refused HAP Scheme
New Playground At The Bawnogues In Kilcock Now Open To The Public
Asylum Seekers Still Allowed Enter Ireland Without Passports Or Documents, Officials Tell Kildare TD