The incident was reported around 3 p.m. Friday, and two inbound lanes were closed for over an hour.
Two people were arrested on the New York City side, but a=it appears the incident started on the other side of the tunnel in Jersey City.
The circumstances surrounding the report of shots fired are still unclear.
The delays caused by the closure were extensive.
Port Authority tweeted the Holland Tunnel to New York has a delay of 60 minutes due to police activity. Motorists were advised to use alternate routes.
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