(from the Express-News)
MEXICO CITY — Police were searching for two prison guards and 40 prisoners who disappeared after a pre-dawn jailbreak Thursday in the Mexican city of Matamoros across the border from Brownsville....
The [federal attorney general's] office said all the prisoners who escaped had been charged under federal law but were being held at the state institution. Five were serving sentences following convictions and 35 were on trial. The statement did not specify the offenses, but drug trafficking is the among the most common federal charges.
State leaders in Mexico have complained in the past that they do not have facilities secure enough to accommodate more serious, federally charged prisoners.
Last year guards stood by as more than 50 prisoners walked out of another jail in northern Mexico.