authorities saying they have made multiple arrests in the case. this comes as attorney general william barr has to mexico to discuss security cooperation following a deadly gun battle between mexican security forces and heavily armed drug cartel. william la jeunesse is following the story from the west coast newsroom. >> all are related. is how it is the u.s. going to go after the cartels? but in mexico, another stunning cartel attacked south of the border. god made an armored truck sparing a cartel logo lighting up a dozen government buildings and gunfire from a 22 dead including for police. this comes one year after the president promised hugs, not bullets would bring peace. has not. the homicide rate climbing, violence spreading in this weekend, protesters took to the streets. >> the truth is they are killing us in mexico, there have been plenty of cases. we don't see results, we don't