A water balloon fight turned into a gun fight at a Birmingham park Friday afternoon.

Two victims -- both senior girls who attend Huffman High School -- were injured when the gunfire erupted about 2:35 p.m. at Tom Bradford Park on Edwards Lake Road. A third person was injured by glass.

"Unfortunately, what started off pleasant turned into shots being fired and a couple of people being grazed by bullets,'' said Birmingham police spokesman Lt. Sean Edwards.

He said the injuries aren't life threatening. One victim was grazed in the eye, and another shot in the buttocks.

Police on the scene believe a group of teens were taking part in a Senior Skip Day. There were at least 15 spent shell casings found in the parking lot.

The initial call went out as a fight. Then there were gunshots reported. A short time later, two victims showed up at St. Vincent's East. Officers said one car on the scene was hit by bullets. Another car that was struck left the scene and is at the hospital.

It appears the gunfire erupted when someone started throwing eggs, which got on the suspect's vehicle - a late-model Chevrolet Tahoe. As the 20-year-old suspect fired, someone from the park returned fire, Edwards said.

No one was in custody as of early Friday evening.

The parking lot was littered with balloons, water guns and shell casings. A short while later, a fight broke out at St. Vincent's East among family and friends of the victims but was quickly diffused by Birmingham police.

The investigation is ongoing.

Birmingham City Schools spokeswoman Chanda Temple issued this statement:

"Birmingham City Schools does not condone students skipping class. The district does not have a 'Senior Skip Day' listed on its school calendar, nor does it recognize 'Senior Skip Day.'

"We are aware of what happened in Bradford Park today. However, we must stress that whatever event took place in the park, it was not connected to any Birmingham high school. Also, the school district did not sanction any events in the park today."