Irish Rail services have been suspended through Harmonstown following a "tragic incident."
Commuters have been told to expect "significant delays" to services.
The incident occurred this afternoon.
Emergency services are currently at the scene of the accident.
https://twitter.com/IrishRail/status/955426217435500545
DART services are running from Kilbarrack to Howth and Malahide, and from Clontarf to Greystones.
Irish Rail has stated that Dublin Bus is accepting rail tickets.
More to follow.