Commuters had a lucky escape when a marble tossed into the air shattered the roof at a LUAS stop, showering those below with glass.
One man was left bloodied after the freak accident caused the glass ceiling over the Kylemore stop on the Naas Road to collapse yesterday morning.
Two men and a woman were sheltering from the strong wind at around 8am when it is thought a marble on the road was sent flying into the air by passing traffic.
It came straight down through the glass roof of the stop, causing it to shatter and crash down on those below.
A spokesperson for Luas operator Transdev said: "We are investigating the incident ... we believe it was caused by something coming down on top of the roof.
"We found a marble at the site and currently we think that a passing car sent it into the air."
A witness to the accident praised Luas workers for their quick response.
"The roof just shattered straight away, and there was no one around except those at the stop," she said.
"Thankfully a first aid team from Luas were there within minutes."
She said that one man was left with "blood and cuts" over his face.
"The top of his head was covered in cuts. He was only wearing a t-shirt, so there were also cuts on his arms," she said.