A man who allegedly shot and killed two residents and wounded several other people, including police officers, at his Minneapolis apartment building opened fire on the victims following a custody exchange, authorities said.The suspect -- who was armed with a handgun -- is dead and an autopsy is underway, Minnesota Bureau of Criminal Apprehension Superintendent Drew Evans said at a news conference Thursday. His cause and manner of death are not clear but investigators believe he "died in an exchange of gunfire" with officers, Evans said.Law enforcement respond to a shooting, Sept. 2, 2026, in downtown Minneapolis.Ellen Schmidt/AP PhotoWednesday afternoon's shooting began outside the suspect's apartment building during what appeared to be an arranged custody exchange, Evans said. The gunman allegedly shot and wounded his child's mother, Evans said, adding that the child was able to escape and was not physically harmed.As the gunman went inside the apartment building, he shot and wounded two building employees, Evans said.Police respond to a shooting, Sept. 2, 2026, in downtown Minneapolis.Ellen Schmidt/AP PhotoThe suspect then took the elevator to ninth floor -- where his apartment was -- and he allegedly shot and killed two men in their 60s who also lived in the building, Evans said.Responding officers heard the gunfire and followed the sound to the ninth floor, where they encountered the suspect and exchanged gunfire, Evans said.The suspect died and two officers were shot and injured, Evans said, noting that a third officer was not shot but also wounded.Authorities respond to a shooting in downtown Minneapolis, Sept. 2, 2026.KSTPWhen officers arrived on the ninth floor they "encountered a haze that significantly limited their visibility," Minneapolis Police Department spokesperson Garrett Parten said Wednesday.Popular ReadsFour officers "experienced adverse effects" from the hazy substance, police said, and two additional officers were injured when their squad car was involved in a crash while responding to the shooting.Minneapolis Mayor Jacob Frey said Thursday that the haze was likely caused by an exploded fire extinguisher.Police respond to a shooting, Sept. 2, 2026, in downtown Minneapolis.Ellen Schmidt/AP PhotoAuthorities respond to a shooting in downtown Minneapolis, Sept. 2, 2026.KSTPA motive is not clear, interim Minneapolis Police Chief Bill Peterson said Wednesday. Law enforcement sources told ABC News investigators are probing whether the suspect had some connection to the building, including whether he was a former or current tenant and whether he was under an eviction notice.Asked about the potential eviction notice, Evans told reporters Thursday, "That will all be part of our investigation.""The residents that were shot and killed on the ninth floor, the exact relationship he had with any of them, and whether or not they were a part of some of the information that was leading up to the eviction process that was underway by the building, is something that we will unpack, and I don't have specifics right now," Evans said.Evans added, "This is once again a situation where domestic violence is center and central to a really terrible situation with multiple people shot. And the role that domestic violence continues to play in mass casualty incidents ... continues to be a problem."ABC News' Luke Barr contributed to this report.