ORANGE COUNTY, Fla. -- Students returned to Odyssey Middle School on Monday even though there are piles of explosives sitting right behind the building.

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Superintendent Ron Blocker was on campus trying to assure parents that their children are safe. He told them their children wouldn't be there if he didn't think it was safe and said the staff is keeping a close eye on students to make sure they stay away from the munitions behind the school.

Two days after the U.S. Army Corps of Engineers blew up 49 explosives at Odyssey Middle School, Blocker was on campus to welcome students back to class.

"Good morning, welcome back," Blocker said Monday morning, greeting students as they got off the bus and talking to parents who were uneasy dropping off their children.

"It is a big concern. I just pray to God they hurry and clean this up," said parent Ada Muniz.

"I don't think they would let them come back to school if they weren't safe. Everybody would sue them back into the stone age," said parent Michael Sitro.

Blocker even reassured students their school is safe again during the morning announcements.

"We're here to guarantee that Odyssey is as safe as it's ever been," Blocker said during the announcements.

During winter break, the Corps of Engineers dug deep around the school and found rockets, canons and even a gun that used to part of the Pinecastle Jeep Bombing Range. The bombs they didn't blow up are still sitting behind the school, three piles of them, and the only thing keeping them from students is a fence.

"They found quite a bit more than I expected them to find and that's what gives me the additional confidence, is that they dug deeper and they were very thorough," Blocker said.

Blocker said the district was aware that it was an old bombing range when they built the school in 2000, but they were assured it was safe. He also said that, if munitions were found as the school was being built, the district was not notified.

The remaining munitions will be blown up on weekends over the next month. The U.S. Army Corps of Engineers also started surveying the land in the nearby Tivoli Gardens subdivision to check for bombs.