Flutterby™! : DEA and Mexico massacre

How the U.S. Triggered a Massacre in Mexico. DEA gets a tip about a Zetas operation and some critical cell phones...

Then the DEA took a gamble. It shared the intelligence with a Mexican federal police unit that has long had problems with leaks — even though its members had been trained and vetted by the DEA. Almost immediately, the Treviños learned they’d been betrayed. The brothers set out to exact vengeance against the presumed snitches, their families and anyone remotely connected to them.

and then tens, possibly hundreds of people are killed and the town of Allende is destroyed.