Three other bars were targeted in similar attacks in Torreon in the past few days.

BBC: Mexican soldiers, 1 Dec 2012, Pena Nieto's inauguration

Another friend told me of a recent visit to Torreon, west of Monterrey.

BBC: Living in fear of Mexico's worsening drugs wars

The attacks happened within minutes of each other in the city of Torreon.

BBC: Mexican soldiers, 1 Dec 2012, Pena Nieto's inauguration