Police arrested three Virginia high school students who allegedly used their cell phones to take pictures and videos up the skirts of their female teachers.

The students, identified as a 15-year-old boy and two 17-year-old boys, were charged with unlawful photography of another and distribution of obscene material, WNEW reported.

“We warn juveniles about sexting and sending inappropriate images to each other and how quickly on cell phone it can just spread,” Crystal Nosal, a spokesman for the Alexandria Police Department told MyFoxDC.com.

The charges come following an earlier arrest of an 18-year-old T.C. Williams High School student, though police say the two incidents are not related.