Waukesha Christmas parade: what we know so far

At least five people are dead and more than 40 people injured after an SUV was driven into crowds on Sunday. Police say a person of interest is in custody

Waukesha Christmas parade: several killed after car speeds through crowd in Wisconsin

A vehicle ploughed into a Christmas parade in Waukesha, Wisconsin, on Sunday afternoon, killing at least five people and injuring more than 40.

Here's what we know so far:

A red sports utility vehicle (SUV) drove at speed into marchers at a Christmas parade in Waukesha, about 20 miles (32km) west of Milwaukee on Sunday afternoon.

Eyewitnesses estimated the car was travelling at about 40mph (67km/h) when it struck the crowds.

Waukesha authorities have confirmed at least five people have died and more than 40 people were injured.

Police have not released the names or ages of the deceased.

Eleven adults and 12 children have been taken to hospital.

The Children's Hospital of Wisconsin said it had received 15 patients from the parade and no reported fatalities as of 8pm Sunday.

The Milwaukee Dancing Grannies posted on its Facebook page that some of its members were among the dead. The organization, which describes itself as a group of grannies that meet once a week to practice routine for summer and winter parades", wrote: Our group was doing what they loved, performing in front of crowds in a parade putting smiles on faces of all ages, filling them with joy."

The police department said on Monday morning the toll of dead and injured could rise.

Police confirmed an officer fired his gun in an attempt to stop the vehicle.

One person of interest is in police custody, with the vehicle involved also recovered.

Police would not say if the incident was terror-related.

Investigators told news outlets they were questioning the person in custody about an earlier crime, which one described as an argument involving a knife. The official cautioned the investigation was still in the early stages.