THORNTON, Colo., Nov 2 (Reuters) - Police in Colorado on Thursday captured a man who they had said calmly walked into a suburban Denver Walmart and fatally shot three people before driving away.

The Thornton Police Department said on Twitter that Scott Ostrem, 47, had been taken into custody. It did not immediately give details.

Authorities had earlier released a surveillance camera photograph of a middle-aged white man wearing a black jacket and blue jeans. They also published a photo of the red four-door hatchback he is believed to have fled in.

16 PHOTOS Multiple people shot at Colorado Walmart See Gallery Multiple people shot at Colorado Walmart THORNTON, CO - NOVEMBER 1: Family and friends wait on a hill to hear word from their loved ones as emergency crews and police on the grounds of the Walmart in Thornton on November 1, 2017 during a shooting. (Photo by John Leyba/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 01: shooting investigation at a Walmart super center November 01, 2017. (Photo by Andy Cross/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 1: Rochelle Ginsner holds her daughter Danielle Carey 16-years-old, an employee, after they were released from the parking lot at Walmart. Danielle Emergency crews and police on the grounds of the Walmart in Thornton on November 1, 2017 during a shooting. (Photo by John Leyba/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 01: shooting investigation at a Walmart super center November 01, 2017. (Photo by Andy Cross/The Denver Post via Getty Images) Patrick Carnes is evacuated in a Walmart cart by SWAT medics from the scene of a shooting at a Walmart where Carnes was shopping in Thornton, Colorado November 1, 2017. REUTERS/Rick Wilking THORNTON, CO - NOVEMBER 01: shooting investigation at a Walmart super center November 01, 2017. (Photo by Andy Cross/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 01: shooting investigation at a Walmart super center November 01, 2017. (Photo by Andy Cross/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 1: Employees and shoppers are released from a holding area in the Walmart lot. Emergency crews and police on the grounds of the Walmart in Thornton on November 1, 2017 during a shooting. (Photo by John Leyba/The Denver Post via Getty Images) Walmart employees and shoppers leave the scene of a shooting at a Walmart in Thornton, Colorado November 1, 2017. REUTERS/Rick Wilking THORNTON, CO - NOVEMBER 01: shooting investigation at a Walmart super center November 01, 2017. (Photo by Andy Cross/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 1: Family and friends wait on a hill to hear word from their loved ones as emergency crews and police on the grounds of the Walmart in Thornton on November 1, 2017 during a shooting. (Photo by John Leyba/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 1: Emergency crews and police on the grounds of the Walmart in Thornton on November 1, 2017 during a shooting (Photo by John Leyba/The Denver Post via Getty Images) THORNTON, CO - NOVEMBER 1: Emergency crews and police on the grounds of the Walmart in Thornton on November 1, 2017 during a shooting (Photo by John Leyba/The Denver Post via Getty Images) Walmart employees walk to a police staging area at the scene of a shooting at a Walmart in Thornton, Colorado November 1, 2017. REUTERS/Rick Wilking Police compare an image on a smartphone to a person they spotted in the crowd at the scene of a shooting at a Walmart in Thornton, Colorado November 1, 2017. REUTERS/Rick Wilking Police guard the entrance at the scene of a shooting at a Walmart in Thornton, Colorado November 1, 2017. REUTERS/Rick Wilking Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Ostrem "nonchalantly" entered the store in Thornton, about 10 miles (16 km) northeast of downtown Denver, and opened fire on shoppers and employees a little after 6 p.m. time, police said, citing witness accounts.

Two men were killed in the shooting and a woman who was shot was taken to a hospital where she died, according to police.

(Additional reporting by Brendan O'Brien in Milwaukee and Gina Cherelus in New York; Editing by Daniel Wallis and Bill Trott)

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