A former U.S. Marine, who had been held in Mexican jail for months after arriving at the border from California with guns in his vehicle, was freed on psychological grounds on Friday, a Mexican court said.
Mexican authorities on Monday said they had arrested four drug gang members involved in the kidnapping of dozens of student teachers who disappeared last month and are feared massacred.
The governor of a Mexican state roiled by the disappearance of dozens of students that has sparked protests and embarrassed President Enrique Pena Nieto, bowed to pressure on Thursday and said he was standing down.
A Mexican mayor and his wife were "probable masterminds" behind the disappearance of 43 student teachers last month in the restive southwest, the country's attorney general said on Wednesday.
