In November 2012, I traveled to Nuevo Casas Grandes, Chihuahua, Mexico. About 45 minutes before we were to arrive in Nuevo Casas Grandes, the bus I was riding in came to a stop at a check point in Janos.
Normally, cars and buses are asked to stop only momentarily while the military and government types check whatever it is they check.
Our bus was going to be allowed to continue on down the road, but people that were riding in another bus all walked out in front of our bus and refused to move.
Apparently, the first bus had been sitting there for four or five hours while authorities completed a criminal investigation. The truth was never made clear, but some of the things we were told were that the military had found drugs on the bus. My guess is that they found a cache of guns, a stash of money, or a fugitive.
Either way, the people that were being detained felt that they were being victimized by the government. They were upset that they were not being able to leave even though they were obviously not being accused of doing anything wrong.
In this video, the driver of the bus I was on is trying to convince the people in front of the bus to move. Eventually, military personnel told the driver to get in the bus and start driving, even if the people did not move. After guns were pointed at the few people who remained in front of the bus, everyone got out of the way.