Police say they've arrested 10 protesters for chaining themselves together and lying down on the George Washington Bridge.

Joe Pentangelo (pehn-TAN'-jeh-loh) of the Port Authority of New York and New Jersey says seven men and three women were in custody at around 8:30 a.m. Wednesday.

It wasn't immediately clear what the protest was about. The Daily News says some outraged commuters — delayed over an hour — tried to pull down protesters' banners.

The George Washington — considered the busiest bridge in the country — spans the Hudson River between New Jersey and New York City.

It's at the center of a trial of two former allies of New Jersey Gov. Chris Christie charged with closing lanes to the bridge to punish a Democratic mayor who didn't endorse the Republican Christie's re-election.