File photo - A woman sits with a candle during a vigil for the victims of the Sikh Temple of Wisconsin shooting, in Milwaukee.

At least seven people have been killed after an armed man opened fire at a Sikh temple near Milwaukee, in the US state of Wisconsin, authorities say. The suspected shooter is believed to be among those killed.

Police were called to the Sikh Temple of Wisconsin in the suburb of Oak Creek, where witnesses said several dozen people were gathering for a service on Sunday. Al Jazeera's John Terrett reports.