Published: Apr 22, 2011 6:49 PM EDT
Updated: Apr 22, 2011 3:49 PM EDT

MEXICO CITY (AP) - Mexican authorities say another 32 bodies have been exhumed from clandestine graves in the northeastern border state of Tamaulipas, bringing the total to 177 this month.

Tamaulipas prosecutors say in a statement that the latest bodies were found in eight pits discovered during the past week.

Authorities began exhuming corpses early this month in the town of San Fernando after reports that people were being kidnapped from passenger buses in the area. It is the same region where authorities say the Zetas drug gang killed and buried 72 Central American migrants in August.

The Zetas are also suspected in the latest massacre.

Thursday's statement indicated that 122 of the unearthed bodies could be those of recently kidnapped passengers.

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