Police are on the search for the tractor trailer that caused a 20 vehicle pile up in Maryland on Monday.

The wreck occurred on Interstate 270 south in Germantown, Maryland on March 19th.

Initially, police believed that a semi truck hauling slate and gravel experienced a load shift, causing the rig to overturn, which was what led to the pile up crash. Now, police are saying that a different, white tractor trailer made an abrupt lane change across three lanes of traffic, causing the semi truck hauling slate to lose part of its load, which then led to the 20 vehicle pile up.

The white tractor trailer fled the scene immediately.

“There’s not a whole lot we’re going to be able to do based on the description,” Sergeant Adam Matthai said to Owings Mills Patch News.

“How many white tractor-trailers are there?” he continued.

“So unless someone were to come forward with more information, there’s not a very good shot we could identify the vehicle.”

The unidentified white tractor was hauling a white dry van trailer at the time of the crash, and was last seen stopping for a moment on the right shoulder of I-270 directly after the collision. The truck then continued south on I-270, fleeing the scene.

Anyone who has any information regarding the white tractor trailer responsible for the pile up crash is urged to contact the Maryland State Police Rockville Barrack at 301-424-2101.