HOLMDEL — Police are investigating a multi-vehicle crash on the northbound Garden State Parkway, south of Exit 117.

UPDATE: Here's what we know Sunday about the Garden State Parkway crash

UPDATE:Parkway crash: 9 people, including 6 children, hurt in Aberdeen collision; car crossed over median

All northbound express lanes have been blocked off while police investigate, according to 511nj.org. As of 2:25 p.m., there were delays on the Garden State Parkway local lanes northbound from south of Exit 114 in the area of Red Hill Road in Middletown to south of Exit 117 in the area of Route 36 in Hazlet. There is currently a five mile delay.

At least two cars were left overturned and mangled, witnesses said.

One person was flown to a hospital, according to police. Their condition was not known.

According to one Twitter user, two cars were "completely demolished," one of which was upside down.

More:Howell crash: Pedestrian suffers life-threatening injuries on Route 9

"The upside down car definitely had someone trapped inside but everyone was trying to flip it back over," tweeted @RozayBeez

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In other news, check out our photos from unusual crashes and accidents from around the state below.