I've recently began following a blog called Borderland Beat. It is covering the escalating violence in northern Mexico. It is depressing reading (and be forewarned if you follow the link -- it sometimes has rather graphic pictures).
Today the Zetas (one of the criminal cartels fighting to control the drug trade) and the Mexican federal police backed by soldiers engaged in a large scale gun battle. So far 47 people have been reported killed, including Tony Tormento who was one of the cartel's leaders. The astonishing video above is gives a feel for the volume of gunfire. I don't speak Spanish so I don't know what the camera men and the people on the streets are saying to each other. Brave man, the fellow who filmed that.
Most sobering to a U.S. citizen is that Matamoros is just across the border from Brownsville Texas and the gunfight was so intense that the University of Texas at Brownsville and Southernmost Texas College had to cancel or move some events. With violence increasing in northern Mexico it seems only a matter of time before a serious and deadly border incident happens.