1 dead, 19 injured after tour bus overturns on George Washington Parkway in Va.

An ambulance arrives at the scene of a tour bus crash on the George Washington Memorial Parkway in Alexandria, Va. on Tuesday, June 14, 2016. (WJLA)

ALEXANDRIA, Va. (WJLA) - US Park Police are investigating a head-on collision between a tour bus and a passenger vehicle that left one person dead and 15 people injured.

"Both vehicles were driven off the road," said Sergeant Anna Rose, U.S. Park Police spokesperson. "The tour bus, which is described as a shuttle bus, landed on its side, and slid for a distance."

Investigators say it happened just before 5 p.m. on Tuesday.

They say the tour bus, with 18 passengers and the driver on board, slammed into a southbound car with two people inside.

The impact sent both vehicles off the road.

Police say the bus flipped onto the driver's side, trapping him or her, and an unknown number of passengers underneath.

"At this point we can confirm one fatality, a passenger on the bus," Rose told reporters. "There were people underneath the bus, the wounded and the fatality were under the bus."

But then, there was a heroic twist to this terrible crash.

"These great citizens stepped forward and helped these people in their time of need," Rose said.

Police say other drivers pulled over and together, lifted the bus off its side, coming to the aid of those trapped underneath.

"There were fifteen to twenty, or an unknown number of people that stopped to help upright the bus," Rose explained. "They then helped the wounded on the bus to get the attention they needed."

Authorities say everyone on the bus, including the driver, are Chinese citizens.

Arriving emergency crews transported the fifteen injured people to Inova Hospitals in Fairfax, Alexandria, and Mt. Vernon.

Late Tuesday, three people were listed in critical condition.

The condition of the two people in the car is unknown.

Investigators are trying to determine if speed or alcohol were factors.

Police have not yet identified anyone involved in the crash.

Authorities are hoping to locate witnesses and those good samaritans.

"Really a noble act by these passersby," Rose said.

Police say the Parkway between Stratford Lane and Mt. Vernon would remain closed several hours overnight, to complete the scene investigation.

Authorities say they don't expect the AM commute to be affected.

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