State officials report that a fire and explosion at a convenience store in northwestern Mexico killed at least 23 people, including children, and injured a dozen others. Prosecutors believe the fire may have started in a transformer, but the exact cause is still under investigation.

​State officials report that a fire and explosion at a convenience store in northwestern Mexico killed at least 23 people, including children, and injured a dozen others. Prosecutors believe the fire may have started in a transformer, but the exact cause is still under investigation.