Police in Webster, New York State have confirmed that all four firefighters involved in the shooting earlier this morning were shot at the scene.
A police spokesman said: "All four firefighters were shot at the scene. One firefighter was able to flee the scene on his own. The other three were pinned down at the location."
"Two received serious injuries from the shots and are being treated at local hospitals."
More top news
The PM told leaders that EU citizens living in Britain for more than five years would be granted the same rights as full British citizens.
Outbreaks of rain across northwestern parts of the UK will move slowly southwards.
The credentials of tens of thousands of government officials, parliamentary staff and police officers are reportedly being traded online.