The demonstrators were said to be part of an immigrant rights group; 10 people were arrested and no injuries were reported

The inbound upper level of the George Washington Bridge was closed by an immigrant rights protest on Wednesday morning, snarling traffic on one of the region's most important crossings at the height of rush hour.

Delays at the bridge for traffic heading into New York from New Jersey were up to nearly 90 minutes; traffic cameras showed bumper-to-bumper traffic barely inching along.

The protesters apparently chained themselves across the roadway to block traffic, unfurling large banners in an attempt to spread their message. One banner appeared to read "Resist, Organized, Act Up!"

Drivers were clashing with the protesters in an effort to get the bridge open, according to witnesses. Police quickly detained the small group and traffic began moving again about 15 minutes.

The Port Authority said 10 people who were blocking the eastbound lanes were arrested. No injuries were reported. The agency said it is investigating. 

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Occupy Theory @occupytheory

George Washington Bridge Closed  

8:08 AM - 26 Oct 2016

The protest organization, Laundry Workers Center — which was using the hashtags #WeAreVisible and #SomosVisible on social media — was already planning a rally in Union Square Park Wednesday night. 

"We are a Grassroots Autonomous Movement campaigning for the right of every member of our communities to be visible, to be able to take part in the decision making process that affect our communities in our "democratic" system, and for the ability to determine our destinies," the group said on its Facebook page. 

Protesters block the inbound upper level of the George Washington Bridge during the morning rush hour on Oct. 26, 2016. 
Photo credit: @SOSUI140 / Twitter