He sat down and nodded to a techie who played the video on the screen in the front of the room: Two men with assault rifles stood in front of the camera, wearing hooded masks.

Timorousness has increased since last year, when immigration officials began raids across the country. More than 1,800 people have been arrested in northern and central California.

It was the first time that such forces had been involved in fighting since the military offensive began in the valley more than a week ago.