An active shooter incident occurred in Midtown Manhattan, New York, officials said. Here's what to know about 345 Park Ave.

The office building, located at 345 Park Avenue, houses some of the country’s top financial firms, including Blackstone, and the National Football League. According to the company's website, Blackstone stands as the world’s largest alternative asset manager, managing over $1 trillion in assets under management.

An active shooter situation is unfolding at the Blackstone building, 345 Park Avenue near East 52nd Street in Midtown Manhattan. A suspect armed with an assault rifle has reportedly shot at least one person,