The last 16 bodies were found on Sunday in four mass graves around the community of San Fernando, some 160 kilometers (100 miles) south of the border with the United States in far northeastern Mexico.

The graves, the largest concentration ever found in one area in Mexico, were discovered with information obtained from a suspect that soldiers detained one day earlier, according to a military statement.

The Mexican army said the suspect, identified as Armando Morales Uscanga, "gave information for the uncovering of four more hidden mass graves."

Officials on Thursday and Friday said 59 bodies had been uncovered in mass graves around San Fernando. Thirteen more were discovered on Saturday.

According to Morales, several of those killed were travelers aboard two coaches who were kidnapped between March 24 and March 29.

AFP