(CNN) -- Mexican authorities have detained a prison director and two other prison officials after 132 inmates escaped from the facility Monday, officials said.

The attorney general for Coahuila state had asked a judge to detain the three prison leaders for 30 days while an investigation into the escape from the border city of Piedras Negras began.

Piedras Negras is across the border from Eagle Pass, Texas, and about 150 miles from San Antonio.

The inmates escaped one by one from what's known as a social rehabilitation center, a minimum-security facility, by using a 7-foot-long tunnel, according to a statement from the state attorney general. The escapees then cut through a chain-link fence and ran through an empty lot.

The tunnel, which was about 4 feet wide and nearly 10 feet deep, began inside a wood shop inside in the prison, authorities said.

Of the escapees, 86 were federal prisoners and 46 were incarcerated on local charges.

Mexican authorities were offering a reward of nearly $16,000 for information leading to the capture of each escaped inmate.

Local and federal authorities are searching for the inmates, and police have set up blockades on roads leading to the Mexico-U.S. border.

U.S. Customs and Border Protection has placed its officers and agents in the area on alert, a homeland security official said.

"At this point, CBP has no reports of escapees attempting to cross the border. We will continue coordinating with our Mexican counterparts as we monitor this situation," the source said.

This escape comes after another one in February when 30 inmates fled after a riot in a prison in Monterrey, Mexico.