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SPRINGFIELD, Mo. (KSPR/CNN) - The Springfield, Mo. fire marshal is investigating two explosions outside the Gamma Phi Beta sorority house at Missouri State University Wednesday.

One person was injured, suffering a minor chemical burn, as she helped clean up debris after the blasts.

Investigators found two improvised explosive devices or chemical bombs behind the house.

The Springfield Fire Department's Bill Spence explains what type of explosives were used and why.

"These devices they're not large. They're not meant to blow a building apart. However what they are designed to do is obviously make a loud noise. They are an over-pressure device they'll rupture. They'll cause physical damage to whatever is in the immediate area," said Spence.

Investigators are searching for suspects in the bombing. They say setting off a device like this may seem like a harmless prank, but it's actually a Class C felony.

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