[FITZ]

In this case, I'm not sure what the Mexican authorities were doing but in general you can't trust that government at all, the citizens of Mexico certainly don't.

[Demidog]

In this case, I'm not sure what the Mexican authorities were doing

From the article:

The ranger was responding, along with the U.S. Border Patrol, to a call for assistance from Mexican authorities who were chasing two men in a vehicle that crossed the border into the Organ Pipe National Monument.