Hazard scare clears US tax office

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A building used by the US tax revenue collection service in the state of Utah has been partially evacuated after reports of possibly hazardous material.

The FBI has confirmed that it responded to a threat of dangerous material in a building in the city of Ogden.

Images on US websites appear to show two people being taken out of the building on stretchers.

But the FBI has said that medical emergencies did not "appear to be related to this incident".

The FBI has also said its investigation is ongoing and it cannot release further details, AP reports.

The building, which houses offices for the Internal Revenue Service, is in an industrial area some 35 miles (55km) north of Salt Lake City.