Investigators are piecing together more details about how a former high school football player who blamed the game for his mental health problems carried out a deadly attack on an office building that is home to the NFL.

A shooting at a Manhattan office building left at least five people dead, sources tell the The Associated Press.

Investigators are combing through evidence in the wake of New York City’s deadliest mass shooting since 2000, trying to figure out more about the gunman who unleashed an assault-style rifle in Midtown,

Police say a gunman who killed four people in a Manhattan skyscraper before taking his own life claimed to have a brain disease linked to contact sports and was trying to target the National Football League’s headquarters in the building.

Four people were killed and a fifth seriously wounded in a shooting Monday at a Midtown Manhattan office tower. A New York City police officer is among the victims. Law enforcement received a call

A man stalked through a Manhattan office tower firing a rifle Monday, killing four people, including a New York City police officer, and wounding a fifth before taking his own life, officials said. The shooting took place at a skyscraper that is home to the headquarters of both the NFL and Blackstone,

The man who killed four people in the New York City skyscraper that is home to NFL headquarters carried a note blaming the league for his mental health problems.

Wearing body armor and wielding an assault-style rifle, the alleged gunman, identified by police as 27-year-old Shane Tamura, burst through the lobby doors of a 44-story office tower in the heart of Midtown Manhattan on Monday,