Authorities in Utah say two men have been arrested on suspicion of placing an incendiary device under a news media vehicle in Salt Lake City.

Police and fire department bomb squads responded Friday when a suspicious device was found under the vehicle parked near an occupied building.

Investigators determined the bomb “had been lit but failed to function as designed,” according to court records cited by CBS affiliate KUTV.

The FBI identified two suspects and served a search warrant at a home in the Magna neighbourhood west of the city’s downtown.

Two men, ages 58 and 31, were arrested and could face charges related to weapons possession and threats of terrorism, ABC affiliate KTVX reported Sunday.

Neighbouring homes were evacuated during the search, which turned up explosives and “explosive-related components,” firearms, illegal narcotics and other paraphernalia, court records say.

Authorities say they also found at least two devices that turned out to be hoax weapons of mass destruction.

There was no information about a possible motive and the relationship between the two suspects wasn’t immediately known.