An off-duty New York City police officer and an executive at an investment firm were among the four people killed by a gunman at a Manhattan office tower.

The officer, Didarul Islam, was working a corporate security detail Monday at that is home to the headquarters of both the NFL and Blackstone, one of the world’s largest investment firms. Blackstone confirmed that Wesley LePatner, a senior managing director specializing in real estate, was fatally shot. Security officer Aland Etienne was also killed, his labor union said.

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