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Mail Bomb on Mexico Campus Injures 2 Professors

A police officer stands guard after a mail bomb exploded at the Tecnologico de Monterey University, on the outskirts of Mexico City, Monday, Aug. 8, 2011. According to authorities of the university, the explosion injured two professors. (AP Photo/Arnulfo Franco)

A police officer stands guard after a mail bomb exploded at the Tecnologico de Monterey University, on the outskirts of Mexico City, Monday, Aug. 8, 2011. According to authorities of the university, the explosion injured two professors. (AP Photo/Arnulfo Franco)  (AP2011)

A mail bomb that exploded in a Mexican campus injured two professors, authorities said.

The prosecutor's office for the state of Mexico says a messenger service delivered the package Monday to the cubicle of one of the victims at a campus of Monterrey Technological Institute.

Prosecutor's spokesman Alfredo Albiter says investigators are trying to determine whether the bomb was detonated with a timer or by touch.

There was no indication of the motive.

Mexico's Interior Ministry says the professors suffered second- and third-degree burns. It says they were able to get themselves to a hospital and are listed in stable condition. Their names haven't been released.

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Based on reporting by The Associated Press.

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