WATCH: Police respond to reported shooting at Great Mills High School in Maryland.

Latest updates here: https://t.co/ttLqQjWsZ0 pic.twitter.com/yaLGZwDpdq

— NBC News (@NBCNews) March 20, 2018

Initial reports of the shooting came after classes at Great Mills began at 8 a.m. ET. About 1,600 students attend the school.

We are Here for you, students of Great Mills 💗 together we can stop this from ever happening again https://t.co/bkzL1FcVgu

— Emma González (@Emma4Change) March 20, 2018

BREAKING: Sheriff's spokeswoman says 3 hurt, including shooter, at Maryland high school shooting.

— The Associated Press (@AP) March 20, 2018