Two advanced life support units and a pediatric emergency crew were among six ambulances initially requested following the pileup, which occurred just after 2:30 p.m., Police Chief James Batelli said.
A doctor also was on scene, he said.
Unconfirmed reports were that the ALS requests were later cancelled.
Although two lanes initially were open, traffic was backed up for miles.
CHECK BACK FOR MORE DETAILS
Click here to follow Daily Voice Mahwah-Ramsey and receive free news updates.