George Zimmerman was placed in custody and is being investigated by police amid claims by his wife that he threatened her with a gun.

Florida television station WKMG Local 6 reported on Monday that Zimmerman was picked up by police at 2 p.m. EST on Monday after his wife, Shellie Zimmerman, said he threatened her and her father with a gun.

"I don't know what he's capable of," Shellie Zimmerman reportedly said in the call. "I'm really scared."

In new audio obtained by TMZ, Shellie screams into the phone: "He's just threatening all of us with his firearm ... he's gonna shoot us!"

According to WKMG, Shellie is heard in the 911 call telling her father to "get behind the car or something."

"I don't know if he's going to start shooting at us or something," she told the operator, adding that she fears her father is going to have a heart attack.

Lake Mary police spokesman Zach Hudson told CNN George was been placed in "investigative detention."

Colin Morgan, deputy of police chief told RadarOnline, "There was some kind of a domestic, we know that with his wife and father-in-law. Apparently there were some weapons involved and threats."

People  later reported at 3:45 pm EST that Zimmerman was not in custody, and he is "free to leave."

The domestic incident comes on the heels of reports that Shellie filed for divorce from her husband of six years. ABC News reported on Sept. 5 that she filed for divorce less than two weeks after she told the same news station the effects of George's trial had on their marriage.

ABC News reported on Aug. 29 that she confessed in an exclusive interview she was unsure if she would remain married to George. She said she is "going to think about it" when asked if she will stay married to him or not.

Shellie said part of the reason she was unsure if she would remain married is because she felt "very much alone" when she attended court alone for perjury charges she faced. In June, 2012, she lied about how much donations they received for her husband's legal fund. George's absence at her hearing was a surprise to her, she confessed, because she stood by his side during his July trial. She was sentenced to one year probation and 100 hours of community service last month.

George was acquitted on July 13 for the February 2012 murder of Trayvon Martin, a 17-year-old unarmed teen. Zimmerman wasn't arrested for Martin's killing, initially, which sparked protests around the country. The chief of Sanford's police department resigned amid the backlash. Zimmerman was eventually arrested and charged 44 days after the shooting on April 11, 2012.

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