A New York City office building where a gunman killed four people then himself has reopened a week after the deadly shootings. On Monday, workers trickled back into 345 Park Avenue in Midtown Manhattan, a skyscraper home to high-profile tenants including the NFL and asset management firm Blackstone.

The officer who was killed was a 36-year-old immigrant from Bangladesh who had served as a police officer in New York City for more than three years.