The Midtown Manhattan building that was the scene of a deadly shooting last week reopened Monday, but under very different circumstances. The building at 345 Park Ave. was once filled with the everyday buzz of office life,

Didarul Islam, an immigrant from Bangladesh and a respected NYPD officer, was among four victims killed in the deadliest New York City shooting in 25 years. Off duty but still in uniform, Islam was working security at an office tower in Midtown Manhattan on July 28 when gunman Shane Devon Tamura opened fire.

Officials say a man carrying a rifle killed four people at a New York City office tower. The shooting took place Monday afternoon at a midtown Manhattan office building that houses finance companies and the NFL headquarters.

The New York City office building where a gunman fatally shot four people and himself reopened Monday, one week after the deadly rampage.Workers returned to 345 Park Ave., in Midtown Manhattan under the watchful eyes of NYPD officers and a surplus of additional security following the mass shooting.

Investigators are examining why the gunman who killed four people before taking his own life at a New York City office tower targeted the National Football League and whether he suffered from a brain disease.

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. New York City police officers and a police dog were seen guarding the building,

The lobby of 345 Park Avenue reopened for the first time since last Monday's mass shooting that left four innocent victims dead.Monday marks one week since the tragedy and it isn't an easy day for employees who returned to work.

The lobby of 345 Park Avenue will reopen for the first time since last Monday's mass shooting that left four innocent victims dead.

After the fatal shootings at Rudin Management’s 345 Park Avenue, building managers and companies are also considering long-term security changes.

Blackstone gave employees the option to return to the office or work remotely. However, the National Football League (NFL) asked employees to continue to work from home at least through the end of this week.