The Indian Point nuclear facility in Buchanan tested its emergency sirens this morning.

All 172 sirens sounded for four minutes around 10:45 a.m., and were heard across Westchester, Rockland, Putnam and Orange counties.

Plant officials stress that the sirens are not a signal to evacuate. In an actual emergency, the sirens would sound to alert the public to tune in to a local EAS radio or television station for important information and direction.

The plant generates as much as 30 percent of the electricity used in New York City and Westchester County.