There's been a crash between a Luas tram and a car on the inbound red line.
It happened at the Junction of Queen St and Benburb St.
Gardai say there are no immediate reports of injuries.
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Emergency services are at the scene.
Luas says trams are running from Saggart/Tallaght to Blackhorse and Smithfield to the Point only due to incident on the line in the city centre.