Mexico is investigating a June shootout between the army and alleged gang members that killed 22 of the suspects, the attorney general's office said in a statement on Friday.
The gunfight took place on June 30 in Tlatlaya on the southern fringes of the State of Mexico, which borders Guerrero and Michoacan, states plagued by gang violence.
At the time, a spokesman for federal prosecutors said all the dead - 21 men and one woman - were believed to be gang members. The shooting started after soldiers came under fire from the suspected gang members, resulting in a gunfight lasting several . . .
