Small explosion reported at Tennessee high school

(CNN) -- A makeshift bomb exploded Thursday, May 3rd inside a high school in Memphis, Tennessee, school officials said.

The Memphis Fire Department received a call about two homemade explosive devices at Craigmont High School. One person was reported injured, said supervisor Tina McNeil of the fire department.

The school has been evacuated, said Staci Franklin, spokeswoman for Memphis schools.

"What it appears is that we had a student or two do a prank," Franklin said.

They made what most would call a "mailbox bomb" that went off in a hallway, she said.

The assistant principal was transported to a nearby hospital to be treated for smoke inhalation.

Craigmont High School is situated on 50 acres in northeastern Memphis, a few miles from Interstate 40.

Monitor FOX6 News and for updates on this developing story.