Police were called to the health centre in the Högdalen area, just south of the city of Stockholm, at 1pm on Tuesday after a car drove into a group of people, Swedish tabloid Expressen reports.
Three people were taken to hospital with serious injuries. Around midnight police confirmed that one of them, a woman in her 90s, had died from her injuries.
Police said the driver is a woman in her mid-80s.
“It is an elderly lady, born 1933, who pressed the wrong pedal and drove into three people. It is not a terrorist act or anything like that,” police control room officer Mats Brännlund told public broadcaster SVT.
The driver, who is understood to have accidentally reversed into the people, was still at the scene when police arrived.
Police have launched an investigation into gross carelessness in traffic.
Some of the damage to the entrance. Photo: Vilhelm Stokstad/TT