Authorities have reopened one of the main highways to the Rio Grande Valley following an bomb threat aboard a bus.

The Kenedy County Sheriff's Department asked authorities to shut down Expressway 77 between Raymondville and Riviera for the investigation Monday evening.

The Texas Department of Transportation (TxDOT) reported the expressway was closed on the northbound lanes at State Highway 186 in Raymondville.

TxDOT officials also closed the southbound lanes from State Highway 285 in Riviera.

Authorities reopened the highway in both directions shortly before 8:30 p.m. Monday.

Texas Department of Public Safety (DPS) reported that the highway had been closed due to a threat that a bomb was aboard a bus.

KZTV-TV in Corpus Christi reported that Investigators used a bomb dog to search the Valley Transit Company bus but found nothing.

Action 4 News spoke with Valley Transit Company.

They said the bus was from Dallas and headed to the Valley.

Company officials did not have a passenger count but said the bus will be late due to the incident.

More information will be posted as it becomes available.