00:10 - Source: CNN
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(CNN) – As outrage over the killing of a Florida teenager continues to spread online, social media and news outlets are debating whether the shooter uttered a racial epithet in one of his 911 calls. And if so, what he might have said.

Zimmerman, whom authorities described as white and family members say is Hispanic, said he shot 17-year-old Trayvon Martin in self-defense, according to police. Martin, who was black, was walking to his father’s fiancee’s house in Sanford, Florida, after a trip to a convenience store and was not armed.

Many people at CNN have listened repeatedly to the call but have been unable to reach any consensus on what was said. An audio engineer enhanced the sound on the 911 call but said it was difficult to improve the quality or to replicate the background noise. CNN continues to analyze the tape and consult outside experts.

In the video above, listen to a nonenhanced recording of relevant audio of Zimmerman’s call at 1:48, after he says, “He’s running.”

Read the full post on CNN’s This Just In blog