'Multiple casualties' in US shooting at Jewish synagogue in Pittsburgh

A gunman opened fire at a synagogue in the US city of Pittsburgh on Saturday, reportedly killing at least four people and injuring an unknown number before he was taken into custody.

The local CBS affiliate reported that eight people were confirmed dead, while Fox put the death toll at four.

A police spokesman addressing reporters at the scene confirmed "multiple casualties" and said three officers where shot before the shooter was taken into custody.

The condition of the officers was not immediately clear. Police were still clearing the building, the official said.

Pittsburgh's Public Safety department, which includes the police, earlier tweeted that an active shooter was in the area near the synagogue, urging residents to stay away.

The Tree of Life congregation is located in the area cited by police, and the incident occurred on the Jewish Sabbath.

Television pictures showed a police SWAT team and ambulances in the area.

It is the latest shooting incident in the United States, where gunmen regularly cause mass casualties and firearms are linked to more than 30,000 deaths annually.