UPDATE 4 p.m.
Officials at a news conference said four police officers engaged the suspect in the Middleton shooting, a suspect who they believe was heavily armed with a semi-automatic pistol and extra magazines of ammunition.
Three other people were wounded seriously, according to police. A fourth person received what police said was a "grazing type of injury."
Authorities have no initial information on the identities of the suspect or victims, or the suspect's motive. They did say he was an employee of the company where the shooting happened.
Watch a live news conference with police about the active shooter incident.
Watch live video as it happened from NBC15 in Madison
Reports out of Middleton, Wis. says that multiple people have been shot inside an office building in that city just outside Madison, and the suspect has died according to NBC15 in Madison.
University of Wisconsin Hospital tells WKOW-TV that they are treating at least four people who have been injured from the shooting. NBC15 in Madison says one of the victims at UW Hospital is in critical condition, while two others are in serious condition. WKOW mentioned a fifth victim as well at St. Mary's Hospital in the area. That victim should survive. Those stations received the information from the hospitals.
Middleton Police Chief Charles Foulke confirmed three shooting victims among the reported five injured, and that there were no other suspects. He said the public was no longer in danger.
NBC15's Tim Elliot said just before 11 a.m. that, according to a source which he says is an employee in the WTS Paradigm building which houses Esker Software, that someone who works in that building opened fire and shot multiple people, and that the shooter was "down."
Middleton Police said that they received the call about a weapons violation at about 10:25 a.m., with a later report about an active shooter.
Watch a report from NBC15 in Madison and reporter Tim Elliot.
Madison.com says that 911 communications in the area received a call at about 10:30 a.m. about the active shooter. They also described a woman leaving the office complex "screaming, saying it was 'a devastating loss.' "
Employees in a nearby building told NBC15 that they saw employees sprinting away from the building where the suspect went inside. They then called 911. According to NBC15, the suspect then fired at victims.
This woman says her husband was in the office where the shooting happened.
My husband ran out of the conference room when the gunfire started. He saw the shooter standing in until middle of the room, everyone else was in the ground. The man running out behind my husband was shot in the shoulder & abdomen.— NurseKelsey (@nursekelsey) September 19, 2018
Having to explain to your 3 year old who overheard you on the phone why Daddy was scared & why he ran away from his job & what a bad man did to people her daddy works with is disgusting. Disturbing. I shouldn’t have to do this.— NurseKelsey (@nursekelsey) September 19, 2018
A TrafficCast employee told Madison.com that he saw a man carrying a handgun inside the building, but did not see any shooting.
Everyone was asked to head inside and keep buildings locked if they are in the multi-block police staging area. Hundreds of people have been evacuated from the scene as well, and officials have said to still avoid the Deming Way area, but the city lockdown has been lifted.
More than one hundred people being evacuated from Deming Way pic.twitter.com/VnyjhRsQEt— Tony Galli (@galli_wkow) September 19, 2018
Families were being notified at a nearby Marriott hotel.