The raid, which took place around 9:30 a.m. during fourth-period classes, took everyone by surprise but was conducted efficiently and quietly with the students being called out of their classrooms and to the office, where they were arrested, school officials said.

The students were charged with felony offenses alleging they delivered drugs in a drug-free zone.

Another student who has moved out of Brazoria County will be arrested later, said Sheriff Charles Wagner.

School district police “had developed information they had a problem over there and decided to do something about it,” Wagner said.

Those arrested ranged from freshmen to seniors, spanning ages from 16 to 19, and included two girls.