The shooter was killed at the scene, police said.

Allen Police Department Chief Brian Harvey said at a press briefing that an officer was at Allen Premium Outlets on an unrelated call when he heard gunshots and located the shooter who was then "neutralized."

"We are asking for the public's help if you are a witness," Harvey said.

At least three people wounded in a mass shooting at an Allen, Texas, outlet mall remained in critical condition on Sunday, according to police.

Four victims were taken to Medical City McKinney, a trauma center in McKinney, Texas, about seven miles from Allen. Three of the patients were in critical condition and one was listed in fair condition, according to a statement Sunday from the Allen Police Department.

Eight victims were killed in the attack and a total of nine people were injured, police said. The shooter, whose name has not been released by police, was confronted and fatally shot by a police officer.

Among the injured, one patient was transferred from Medical City McKinney to Medical City Plano and was in fair condition. Another patient was transferred to Medical City Children's Hospital in fair condition, police said.

"We are a strong and caring community and we want all of the victims and their families impacted by this tragedy to know that we will wrap our arms around you, and we are here for you," Allen Mayor Kenneth M. Fulk said in a statement released Sunday. "The City of Allen pledges to offer our complete support. We know you are grieving, we are grieving. Rest assured, the nation and the world are also grieving."