GARDENDALE, Ala. (AP) -- Authorities stopped a truck and temporarily closed Interstate 65 north of Birmingham on Tuesday, backing up traffic for miles in an investigation that included homeland security officials.

Tracey Ayres, a spokeswoman for the Alabama Department of Homeland Security, said the Secret Service, the U.S. Department of Homeland Security and other agencies were involved.

"This is an ongoing investigation," she said.

Video from television news cameras showed a truck with its rears doors opened and law enforcement vehicles all around. Traffic crept by in a lane that wasn't blocked after the roadway was reopened.

GARDENDALE, Ala. (AP) -- Authorities briefly closed Interstate 65 Tuesday after a police dog indicated explosives were on board a truck that had been stopped for an improper tag, but a search turned up nothing.

FBI spokesman Jeff Fuqua said federal law enforcement learned of a tractor-trailer rig traveling with an "obviously altered tag" and notified police.

Fuqua said officers from Birmingham and Gardendale stopped the vehicle, and a dog sniffing around the truck indicated the presence of explosives. Police closed the interstate north of Birmingham but reopened it after a search of the truck found nothing dangerous.

"It turned out to be a whole lot of nothing," said Fuqua. [...]

The driver of the truck was given a ticket for having an improper tag, Fuqua said. [...]