A woman in her 30s was rushed to hospital after being knocked off her bike by a truck.
The crash happened in Dublin's city centre shortly after 9pm on Tuesday.
The cyclist was on Cuffe Street when she was hit by the truck.
Gardai and emergency vehicles raced to the scene.
It is understood that the cyclist was wearing a jacket with high visibility and had front and rear lights at the time of the crash.
The investigation is ongoing.
A Garda spokesman said: "Gardaí attended a 2 vehicle rtc involving a truck and bicycle that occurred on Cuffe Street shortly after 9pm last night.
"A female in her 30s was taken to St James hospital to be treated for her injuries."
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