Three students at a Broward County middle school have been suspended for what school officials say was inappropriate sexual activity in a classroom.

The students from Glades Middle School in Miramar were suspended this week and face expulsion. School officials and police say the students are about 13 years old and more may be involved.

Two teachers have been reassigned while the district investigates. The activity was allegedly going on in their classrooms.

Authorities have not described the inappropriate conduct.

Principal Krista Herrera sent a letter home with students Tuesday, assuring parents that students at the school are safe.