UPDATE (March 28):

Police say no explosive devices were found in the car of a man arrested in West Virginia after threatening to kill President Trump.

According to West Virginia State Police, a gray sedan with Missouri license plates was spotted driving at more than 130 miles per hour eastbound on Interstate 68 and stopped near mile marker 30 in northeast West Virginia.

Troopers said the 42-year-old driver appeared confused and was making "concerning statements" which led the trooper to believe there could be explosives in the car.

The driver was immediately detained and all lanes of the interstate were shut down for safety concerns.

Three explosive-detecting K-9s were deployed to the scene with WVU Police Department K-9 handlers Lieutenant Josh Cook and Sergeant Zack Camden, and, according to police, all three indicated the presence of explosive materials in the vehicle.

But when a West Virginia State Police Explosives Response Team carried out their own search, no explosives were found. They were assisted by explosives response teams from Maryland State Police and the West Virginia University Police Department as well.

The situation remains under investigation with assistance from the FBI, ATF, and the Secret Service.

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A man has been arrested for threatening to kill the President of the United States after a traffic stop that temporarily shut down Interstate 68 in northern West Virginia.

Beginning around 10:30 a.m. on March 27, all lanes of I-68 in Preston County were shut down at mile marker 30 for what was listed as "police activity."

According to West Virginia State Police, a traffic stop was initiated at that time of the morning.

State troopers pulled over a vehicle for speeding on the eastbound side of the interstate, but determined during the stop that a more in-depth investigation was needed, which resulted in shutting down the interstate.

Traffic was diverted off the interstate and motorists were advised to take alternate routes. Westbound lanes were shut down in western Maryland.

FBI agents were called to the scene to assist in the investigation.

By 2:30 p.m., the interstate was back open.

Later in the afternoon, police confirmed to media outlets that a search of the car turned up a firearm and black powder.

The 42-year-old driver was detained for threatening to kill President Trump and blow up the Pentagon, which caused the prolonged interstate shutdown for investigation.

The Secret Service has joined the investigation alongside West Virginia State Police and the FBI.

Police have not yet identified the man arrested.