MONTGOMERY CO., Va. -

UPDATE: Three people are injured and one person has been airlifted to a hospital after an accident on I-81 North in Montgomery County.

It happened around 2:30 Friday afternoon at mile marker 124.

According to Virginia State Police, a Ford Explorer overturned and landed on its top. One person was ejected from the vehicle.

Traffic is moving.

We'll have more information as it becomes available.

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UPDATE: The north left lane is open on I-81 North at mile marker 124 in Montgomery County.

Traffic is backed up for about four miles.

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UPDATE: Traffic is backed up for six miles on I-81 North in Montgomery County.

The accident happened at mile marker 124.

Both northbound lanes are closed.

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An accident on I-81 North in Montgomery County has both lanes closed.

The accident is at mile marker 124.

Drivers should use caution and expect delays.