Two construction workers died at John F. Kennedy International Airport in New York City on Monday morning, CBS New York reported. 

The workers were trapped in a trench for more than an hour after an accident at an airport construction site that involved some kind of collapse, according to the news station, which recorded aerial footage of the scene outside the generating facility that provides power to JFK. The collapse happened at around 11:25 a.m. local time.

Video footage shows numerous first responders crowded around what appears to be a long and narrow ditch cordoned off by planks, while the arm of a bulldozer parked near the edge reaches downward. 

Both individuals trapped in the trench were transported to a hospital after being pulled out, CBS New York reported, but neither survived their injuries.

Details about the construction site collapse and how it may have occurred are still unclear. JFK Airport had not commented publicly on the incident or the workers’ deaths as of Monday afternoon.