LAKE MARY, FL (NBC) Florida police are investigating a dispute between George Zimmerman and his wife Shellie, who called cops and said he had his hand on his gun, an official said.

Lake Mary Police public information officer Zach Hudson said police were at the home, investigating a "possible domestic battery." George Zimmerman was being detained but had not been arrested, Hudson said.

Police received a call at 2:10 p.m. from Shellie Zimmerman, who filed for divorce last week — little more than a month after he was acquitted of second-degree murder in the shooting death of teenager Trayvon Martin.

She said her husband of five years was in an argument with her and her father and had has hand on his gun, Lake Mary Police Chief Steve Bracknell told NBC News.

No other details were available. Attempts to reach George Zimmerman's lawyer were not immediately successful.

Shellie Zimmerman told ABC News last week her husband was "selfish" and has been making "reckless decisions."

"In my opinion, he feels more invincible" since his acquittal, she said.

After a trial that transfixed the nation, a jury found George Zimmerman, 29, not guilty in the death of Martin, 17. He argued that he shot Martin, who did not have a gun, in self-defense after being attacked.

The verdict sparked protests and debate on race and guns that stretched all the way to the White House. In the weeks since, George Zimmerman has helped rescue a family after a car wreck and been pulled over for speeding twice.