The all-clear was given Thursday afternoon at Harris Middle School where some bullets were found.
The North East ISD school was placed under lockdown at 10:45 a.m. after six bullets were found in a school hallway, North East ISD spokeswoman Aubrey Chancellor said. Two additional bullets were later found during a search by a canine team.
The lockdown was lifted at around 2 p.m.
Chancellor said surveillance video is being reviewed to determine how the bullets made it on campus.