[Updated 6:10 p.m.] Suspected shooter Radcliffe Haughton has been found dead from an apparent self-inflicted gunshot wound, Brookfield police Chief Daniel Tushaus said. He was found inside the salon where the shooting occurred.

[Updated 5:38 p.m.] Froedtert Hospital - the Milwaukee medical facility where four shooting victims are being treated - has "resumed normal operations" after earlier being placed in lockdown mode, the hospital said on its website.

"We are certain that our environment is safe," the hospital said in an update published at 4:25 p.m. CT.

[Updated 5:20 p.m.] President Barack Obama learned of the shooting around 12:30 p.m. CT from homeland security adviser John Brennan and then had a follow-up call an hour later involving, among others, FBI Director Bob Mueller, a White House statement said.

"The president was informed that the shooting did not appear to be terrorism-related," the statement said.

Earlier, Wisconsin Gov. Scott Walker offered '"our thoughts and prayers to the victims" and "the law enforcement and community support they need to heal in the coming days."

[Updated 4:56 p.m.] Authorities working to clear the building where Sunday's bloody shooting took place "believe we have identified what is being described as an improvised explosive device," Brookfield police Chief Daniel Tushaus said.

The device is "hampering our clearing of that building," the chief added.

[Updated 4:41 p.m.] Authorities "believe" three of the seven people shot Sunday have died, according to Tushaus.

The shooting took place around 11 a.m. CT (noon ET), the chief explained.

Authorities have been able to track down a 2003 Mazda Protege linked to the suspect - which was found outside the city of Brookfield - but the suspect remains at large. He's been identified as Radcliffe Haughton, who Tushaus said weighs 270 pounds and stands just over 6 feet tall.

[Updated 4:10 p.m.] Bomb squad personnel are at the scene of the shooting, Brookfield police Lt. John Beth said, pointing to concerns there may be explosives at the site.

[Updated 3:42 p.m.] ATF spokesman Thomas Ahern identifies the suspected shooter as Radcliffe Haughton, 45, of Brown Deer, Wisconsin. The shooting is being investigated as a possible domestic-related incident, according to Ahern. The suspect remains at large.

[Updated 3:29 p.m.]ATF spokesman Thomas Ahern confirms to CNN that seven people were shot by a lone gunman at the Azana Hair Salon and Spa. "Employees said a man entered the salon, workers saw a firearm - a handgun of some sort," Ahern told CNN's Susan Candiotti. "An employee said to the gunman something like, 'If you're gonna rob the place, rob the place,' and then (the gunman) opened fire."

[Updated 2:24 p.m.] FBI and ATF agents are among the authorities at the scene, CNN affiliate WISN reports.

[Updated 2:07 p.m.] The nearby mall and some other buildings are on lockdown, CNN affiliates report.

[Updated 1:56 p.m.] CNN affiliate WTMJ reports authorities are looking for a suspect.

[Updated 1:54 p.m.] CNN affiliate WISN reports that a witness described seeing two women leaving the spa, apparently injured.  One crawled out and was taken by emergency responders.  The other was treated by emergency personnel in a squad car.

[Updated 1:32 p.m.] Hospital spokeswoman Nalissa Wienke tells CNN all four people in the emergency room appear to have non-critical injuries.  She could not say whether the injuries were due to gunshots.  At this time, the hospital does not believe it will need more staff, she said.

[Updated 1:28 p.m.] Numerous emergency vehicles are at a spa in Brookfield, Wisconsin, as local news agencies report a shooting took place.

Four people are in an emergency room, and another three are on their way, said Beth Strohbusch of Froedtert Hospital in nearby Milwaukee.

CNN affiliate WTMJ says the Waukesha Sheriff's Department confirmed there was a shooting, and that witnesses say it was either at or near the Azana Salon and Spa, which is across the road from Brookfield Square Mall.

CNN affiliate WISN called it a "mass shooting."

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