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The Latest: Authorities: Workplace shooter died of gunshots

MIDDLETON, Wis. (AP) — The Latest on a Wisconsin workplace shooting that injured four people and left the gunman dead (all times local):

2:20 p.m.

Authorities have identified the gunman who died after shooting four co-workers at a Wisconsin software company.

The Dane County Medical Examiner's Office says 43-year-old Anthony Y. Tong died from "firearm related trauma" in Wednesday's shooting at WTS Paradigm in Middleton.

The medical examiner says an autopsy was conducted Thursday and that additional testing is underway.

Authorities say Tong seriously wounded three co-workers during the attack, and that a fourth person suffered a graze wound. Police say the gunman was fatally shot by responding officers.

The investigation involves Middleton police, the state Division of Criminal Investigation and the Dane County Medical Examiner's Office.

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1:50 p.m.

Police are escorting employees back to a Wisconsin software company where an employee opened fire on co-workers a day earlier.

Officers are helping the workers collect cellphones, keys, pursues and other personal items they left behind as they fled the shooting Wednesday morning shooting at WTS Paradigm in Middleton.

Police Chief Chuck Foulke said Thursday that officers still have control of the building as they investigate the shooting that left three employees seriously wounded. The gunman was fatally shot by police.

Police still don't know why the man attacked his office. His name hasn't been released.

You Tube videos about the software company show a workplace where employees can play ping-pong and shuffleboard, and gather at a coffee bar or sit on an outdoor patio.

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11:15 a.m.

Police say the gunman who was killed by officers after shooting four people at his Wisconsin workplace is a 43-year-old man who had been employed at the software company since April 2017.

Middleton Police Chief Chuck Foulke declined to identify the gunman during a news conference Thursday, but he says the man had no criminal history and no prior contact with area law enforcement officers.

Foulke says officers searched the man's home in nearby Madison late Wednesday, several hours after the man opened fire inside WTS Paradigm.

Foulke says two men and one woman were seriously wounded in the attack and remain hospitalized. UW Health says all three are in serious condition.

The chief says the gunman arrived for work and sometime later opened fire on his colleagues. An autopsy by the Dane County Medical Examiner's Office is scheduled Thursday.

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9:30 a.m.

A hospital says the condition of the person most seriously wounded during a shooting at a Wisconsin software company has improved.

Spokeswoman Lisa Brunette said Thursday that the person critically injured in Wednesday's shooting at WTS Paradigm has been upgraded to serious condition at University Hospital in Madison.

Two others injured in the shooting are also hospitalized in serious condition. Police say a fourth person was grazed by a bullet when an employee opened fire inside the company's office in nearby Middleton.

Police say responding officers fatally shot the heavily armed worker. Authorities have not identified him or a possible motive for the Wednesday morning attack.

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8:50 a.m.

Law enforcement officers have searched a house in Madison in the investigation into a shooting at a Wisconsin software company.

Dane County Sheriff's Office spokeswoman Elise Schaffer says officers searched the residence late Wednesday on the city's southwest side following the shooting earlier that day at WTS Paradigm in nearby Middleton.

The shooter, a company employee, shot and wounded four people before he was fatally shot by officers.

Schaffer declined to say if the house belonged to the gunman, whose name has not been released. Three people suffered serious injuries, while a fourth sustained a graze wound.

Middleton police say the gunman fired at officers before he was shot.

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11:30 p.m.

Authorities say they still don't know why a Wisconsin software company employee went to his office with a pistol and extra ammunition and opened fire on his colleagues, seriously injuring several before he was fatally shot by police.

The attack happened Wednesday morning at WTS Paradigm in Middleton. Investigators haven't released the suspect's name but say he lived in nearby Madison.

Middleton Police Chief Chuck Foulke says three victims suffered serious injuries, while a fourth suffered a graze wound.

Foulke says officers were on the scene and shot the man within eight minutes of getting an emergency call. Foulke says the man was using a semi-automatic pistol and had extra magazines, and that he believes officers prevented more bloodshed.

He says the man fired at officers before he was shot.