Photo: John Lamparski/AFP/Getty Images

A lone gunman carrying an assault-style rifle opened fire at an office building in midtown Manhattan on Monday evening, according to police. The building, 345 Park Avenue, contains offices belonging to the National Football League, Blackstone, KPMG, and Bristol Myers Squibb, among others. At least three people were injured and the suspected gunman is reportedly dead. Below are the latest developments.

This breaking news post has been updated.

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