A group called the Overpass Light Brigade hold a sign as they gather during a vigil at Cathedral Square to honor victims of Oak Creek in downtown Milwaukee, Wisconsin. (Reuters)

A woman prays near a Sikh temple in Oak Creek, Wisconsin following a mass shooting inside and outside the temple. (Reuters)

Police walk around police tactical vehicles near the Sikh temple in Oak Creek, Wisconsin following a mass shooting inside and outside the temple. (Reuters)

Members of the Sikh Temple wait for news following a mass shooting that left seven persons dead including the shooter in Oak Creek, Wisconsin. Four people were shot inside the Sikh Temple of Wisconsin in suburban Milwaukee and three outside, including a gunman killed by a police officer, said Greenfield Police Chief Bradley Wentlandt. (Reuters)

An Oak Creek police officer (L), speaks with members of the Sikh Temple in Oak Creek, Wisconsin following a mass shooting inside and outside the Sikh Temple. (Reuters)

A distraught woman is helped to a car outside of the Sikh temple in Oak Creek, Wisconsin. (Reuters)

A distraught woman is comforted outside of the Sikh temple in Oak Creek, Wisconsin. (Reuters)

People hold a large sign while attending a candle light vigil at Cathedral Square in downtown Milwaukee, Wisconsin. (Reuters)

People light candles during a vigil at Cathedral Square to honor victims of Oak Creek in downtown Milwaukee, Wisconsin. (Reuters)

Officials gather near the Sikh Temple in Oak Creek in Wisconsin following a mass shooting inside and outside the Sikh Temple. (Reuters)