Mexico shootout leaves 21 dead
Irapuato is located northwest of Mexico City in Guanajuato, a state plagued by organised and violence, which is also home to industry and a number of major auto manufacturing plants.
This, combined with the state's significant energy sector, have attracted groups such as the powerful Jalisco New Generation and Santa Rosa de Lima drug cartels, which are also involved in extortion, kidnapping and fuel theft.
On 21 June Mexican authorities announced the arrest of 26 alleged members of Santa Rosa de Lima after burning vehicles were used as blockades in the cities of Celaya, Salamanca and Villagran.
Following the violent episode President Andres Manuel Lopez Obrador said that his government would not allow the country "to fall into anarchy and disorder".
Just days before, six members of a family, including a minor, were reported murdered in Celaya.