Sixteen truckers who were part of the recent truck convoy protests in the D.C. region are suing the District for setting up blockades that prevented them from exercising “their constitutionally protected right to free speech” on the streets of D.C.

The civil case, filed in the U.S. District Court of the District of Columbia on Monday, says that the plaintiff’s First Amendment rights were violated. It states the truckers were seeking to protest the government’s “continued state of emergency declaration and COVID-19 related policies” and that they also wanted to honor 13 military members who died in Afghanistan during the withdrawal from the country last summer. Plaintiffs are seeking a jury trial.

The truckers say they were rebuffed by D.C. Police and Department of Public Work vehicles that blocked exits on I-395 and I-695 on multiple days in mid-March. Police at the time say they closed the exits “to keep traffic moving safely,” according to the Washington Post.

Trucks are not allowed on some downtown streets.

The plaintiffs asked police to move their vehicles so they could get by, but they say they were threatened with arrest if they didn’t move along. The truckers gathered in Hagerstown, Maryland, but are from Illinois, Pennsylvania, Florida, California, Wisconsin, West Virginia, Oklahoma, Kansas, and Nevada, according to the filing.

They are suing for violation of due process, not granting equal protection, and violation of free speech. They also claim that the blockade is directly responsible for a crash that killed two when a speeding vehicle hit a dump truck on the interstate.

The D.C. Attorney’s General Office declined to comment.