Final Update 12:48 p.m.: With buses turning around and Streamline hearings cancelled today, those chained at the federal courthouse parking lot entrance decided to unchain themselves, save the PVC pipe for the next action and end the protest. Puente organizers announced other ICE shutdown actions are planned for Monday in Phoenix. Those who blocked the parking lot entrance at the federal courthouse were arrested anyway.

Update 12:30 p.m.: Bus action is almost over. TPD cut through pvc tubes and chains, and folks blocking buses were arrested. Those at federal courthouse are standing up and celebrating, but remain linked together. Remaining protestors are now off the sidewalk and in the street. Also announced: Streamline court shutdown for today in Tucson as a result of the action.

Update: Tucson Police Department officers are at the scene of the bus blockade at I-10 and 18th Street with equipment to cut through PVC pipe and chains. You can follow along at www.notonemoredeportation.com.

Early this morning, folks from Puente, Derechos Humanos and No More Deaths blocked two buses carrying undocumented detainees on their way to the federal court house for their Streamline hearings. The buses were stopped at I-10 and 18th Street, and people chained themselves to tires at each of the buses, while another group chained themselves at the entrance to the DeConcini Federal Courthouse parking lot.

• Henry Barajas

At the bus blockade and action, reporters have been told to stay away from the buses and behind yellow tape, while at the DeConcini courthouse, everyone is being asked to stay on the sidewalk and are prevented from taking photos on the mediums. At the federal courthouse, about two hours into the action, about 24 armed U.S. Marshals were dispatched to surround the protest in different areas across the street, on the mediums and each end.

U.S. Marshals and other security personnel outnumber protestors almost two to one.

Reports are that Tucson Police are preparing to move in—first getting rid of photograhers and reporters. TW web editor Henry Barajas is headed back to the office with an update.