Multiple casualties as gunman opened fire in the lobby of the midtown Manhattan building on Park Avenue that is home to the Blackstone investment firm and other corporations before moving to other floors.

An NFL employe was seriously injured on Monday in a shooting at a New York City office tower that killed four people, commissioner Roger Goodell said in a statement.

Mobile police have released the identity of the man killed in a shooting Friday afternoon. At approximately 2:46 p.m., officers responded to the 400 block of Earle Street in reference to a shooting, according to a previous release. Upon arrival, officers discovered Cameron Madison, 24, with a gunshot wound.

Here's how NFL players, coaches and executives reacted to a mass shooting at the league's office building in Manhattan:

NYC is mourning NYPD Officer Didarul Islam and three other people killed in Monday's shooting inside an office building at 345 Park Avenue.

Jackson County Circuit Judge Susan Jordan sentenced Kevin Jamall Johnson Wednesday, July 23, to two years on probation and a suspended sentence of 93 days in jail, court records show.

Arriving officers found 11 people shot including a 27-year-old man pronounced dead at the scene, Schierbaum told reporters during a late-morning news conference. The other 10 victims included an 18-year-old man who was taken to a hospital in critical condition.

Shane Tamura, the suspect in the deadly shooting in Midtown Manhattan, carried a note in his pocket claiming he suffered from CTE and also made references to the NFL, police sources told ABC News.