At least one gunman opened fire during morning services at a Sikh temple in Oak Creek, Wisconsin, and remained on the loose inside the temple, possibly holding hostages, according to witnesses.
Police, ambulances and the fire department were on the scene at the temple.
The dispatcher for Oak Creek Fire Department said first reports of the shooting came in about 10:30am local time.
Two witnesses said the shooter or shooters were still inside the building.
More top news
Newly released emails to a Muslim campaign group reveal Mohammed Emwazi felt "controlled" under the watch of the security services.
Five members of the Armed Forces have been granted operational honours and awards in recognition of their service.
The Conservative peer said he was 'shocked' that the law had been vetoed by the Liberal Democrats.