Three people were arrested Thursday morning after police investigated a tip about a teenager making threats against Del City High School.

Police were called shortly before 11 a.m. in reference to a 17-year-old across the street from Del City High School with a firearm and possibly making threats against the school. 

Officers arrived less than five minutes later and found a juvenile with a semi-automatic pistol. 

Police said they learned there were two other people seen with 17-year-old prior to officers arriving on the scene. 

Officers found a 16-year-old and an adult on school grounds. The 16-year-old also had a semi-automatic pistol. 

The names of the two teenagers were not released. The adult was identified as 19-year-old Andrew Lee Stiffler. 

The investigation is ongoing and charges are expected to be filed soon.

Anyone with information is asked to call the Del City police at 405-677-2443.