Who committed the massacre in San Miguel Totolapan, Guerrero?

Whoever was responsible for the massacre that took place in Totolapan, which took the lives of 20 people, is hiding in the shadows of the lawless state of Guerrero.

Who committed the massacre in San Miguel Totolapan, Guerrero?
The city hall in San Miguel Totolapan, Guerrero, Mexico, after an armed attack that killed 20 people, including the mayor. Credit: AmapolaPeriodis