A sheriff in eastern Ohio says two girls are accused of poking 11 students at their middle school with a lancet, a pricking device commonly used to obtain small blood samples from diabetics.

Belmont County Sheriff Fred Thompson say the girls, ages 12 and 13, were charged with assault Thursday. He did not release their names.

Bellaire Local Schools officials say the students were pricked Wednesday morning and that parents had been advised to have them tested for possible problems.

Thompson says the girls were held overnight in juvenile detention. He did not know whether they had been released.