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LAKE MARY (CBSMiami) — The 911 calls have been released surrounding the shooting incident with George Zimmerman in Central Florida Monday.

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The unidentified 9-1-1 caller, on behalf of Matthew Apperson who was involved in the shooting with Zimmerman, said “a guy just had to pull a gun on a guy.”

“A guy right here said he had to shoot someone thru his window, so he wants the police to come,” said the 911 caller.

The person who was shot at was George Zimmerman, the man acquitted of killing Miami Gardens teen Trayvon Martin.  Apperson said he shot at Zimmerman in self-defense, but police are not revealing specifics.

CLICK HERE to watch Ted Scouten’s report

“The detectives are working diligently to uncover what exactly occurred and the events leading up to that,” said Bianca Gillett with the Lake Mary Police Department.

As of Tuesday evening, no one had been charged. Police said they were waiting to get full statements from both men. Legal experts figure it’s only a matter of time.

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“We’re going to see charges filed. You don’t discharge a fire arm in the middle of traffic, into an occupied vehicle and expect that nothing’s going to happen here,” said Attorney Steven Krammer.

Krammer said Apperson’s self-defense claim means he’ll have to show he was in fear for his life.

“There’s a bullet hole window through George Zimmerman’s car.  He discharged the firearm, no question about that, no proof to be made. The only question is was Apperson justified, maybe through Stand Your Ground, discharging this fire arm,” said Krammer.

Complicating the case, the two men have a past.

They’ve had two run-ins in the past where Apperson claims Zimmerman was the aggressor.  Police are sorting through all of it and urging any witnesses to come forward. They promise a slow, methodical investigation.

“A gunshot on a public road in Lake Mary is a big deal, and for that reason they want to get all their ducks in a row.  So just because nobody’s been charged yet, it doesn’t mean it’s not going to happen,” said Krammer.

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After speaking to both men, police will decide if they will file any charges.  Those charges could range from aggravated assault with a firearm to shooting into an occupied vehicle. That could carry a sentence of up to 30 years in prison.

Ted Scouten