EDMOND, Okla. (KFOR) - One person is in custody after Deer Creek High School was placed on a brief lockdown Monday afternoon, officials say. An email sent to families from Deer Creek School District said the school was placed on a modified lockdown after students noticed someone on campus who wasn't a student. PREVIOUS COVERAGE: Activities canceled, buses delayed at Deer Creek HS after brief lockdown That person was taken into custody by local law enforcement and the lockdown was lifted. "We are thankful for our continued partnership with law enforcement who worked tirelessly on this and kept us informed throughout the night. Once again, we also want to thank the students who reported their concerns to the administration, allowing us to implement our safety measures in an efficient manner yesterday." said Deer Creek officials. The school says students should have their DCHS badges visible at all times. Students are also asked to not open exterior doors to any staff or students not wearing a badge.