At least eight people are dead and several others injured after a pick-up truck drove into pedestrians and cyclists in New York.
It happened in Lower Manhattan, near the World Trade Center site just after 3pm local time.
According to the NYPD, the truck was driven down a path & cycle lane.
The truck hit multiple people before crashing into another vehicle, with photos from the scene showing a damaged school bus.
The suspect got out and displayed an imitation gun before being shot by officers. He is currently in custody in hospital.
"This was a vicious and heartless attack on the people of New York, striking just a few blocks from the site of the 9/11 atrocity", said Taoiseach Leo Varadkar.
"I would like to express our solidarity with New Yorkers, who have faced considerable adversity in the past. Our thoughts and prayers are with the families and friends of the victims."