Wisconsin officials will seek to charge a driver who ploughed into a Christmas parade on Sunday with five counts of intentional homicide.
Police said Darrell Edward Brooks Jr, 39, killed five people, aged between 52 and 81, and injured 48 others, including young children, in Waukesha.
Mr Brooks was fleeing a domestic disturbance when he mowed into the crowd, they said.
They added he could face further charges based upon their investigation.
Waukesha police also said the incident was not an act of terrorism.
Several school children and grandparents were among the victims.
What do we know about the victims?
The victims named on Monday were:
- Mr Wilhelm Hospel, 81
- Ms Virginia Sorenson, 79
- Ms LeAnna Owen, 71
- Ms Tamara Durand, 52
- Ms Jane Kulich, 52
They include members of the Milwaukee Dancing Grannies, who are a regular fixture in the city's parades.
"Our group was doing what they loved, performing in front of crowds in a parade putting smiles on faces of all ages," the group wrote in a statement on Facebook. "Those who died were extremely passionate Grannies."
Dozens of people remain in hospital. Police said the injured were taken to six area hospitals by first responders as well as other residents who were at the parade.
Eighteen children were admitted after the incident, the Children's Wisconsin paediatric hospital told reporters on Monday.
Care providers described the incident as one of the state's largest mass casualty events involving children in recent history. Physicians said some children sustained serious head injuries and broken bones.
The injured range in age from three to 16 and include three sets of siblings, medical staff said. Ten children required treatment in the intensive care unit.
The Roman Catholic Archdiocese of Milwaukee said one of its priests, multiple parishioners and students at a local Catholic school were also among the injured.