MILWAUKEE: The gunman who opened fire at a day spa in the US state of Wisconsin, killing three people and injuring four, has been found dead, police said Sunday.

A police spokesman in Brookfield, Duane Bondar, told AFP the suspect was dead but did not offer further details. Local media cited sources saying the man, Radcliffe Haughton, likely died from a self-inflicted gunshot wound.

3 dead 4 injured in Wisconsin shooting

At least three people were dead and another four injured in the state of Wisconsin in the United States, after a gunman opened fire in a shopping center in the town of Brookfield, near Milwaukee.

The body of 45-year-old Radcliffe Houghton was found in the building where he allegedly opened fire killing three people and injuring four. The suspect in the shooting may have committed suicide.

The motive for the crime was allegedly a family quarrel.

A SWAT team and investigators were on the scene.

There are also reports that a bomb-disposal unit was called in and were disarming an improvised explosive device left at the scene.

The shooting prompted the closing of the shopping center and the evacuation of all of the visitors.

Earlier, police was reporting that they are searching for an African American individual who was apparently wearing a military uniform.

Police have not officially released any more information on the shooting. (AFP)