Six men were crushed under 100 tons of rock and coal on Friday when a mine in the Mexican town of Muzqiz caved in. Just last week, the town buried seven victims–all members of the same family– of a methane gas blast at another mine. According to the company that runs the mine that collapsed yesterday, the tragedy was caused by "a pocket of methane gas." By contrast, state officials said that the rockfall was not caused by a gas explosion. In 2011, 30 people died in similar accidents in the region.