Former neighbourhood watch volunteer George Zimmerman, who was acquitted of murder over the fatal shooting of unarmed black teenager Trayvon Martin, has been stopped for speeding on a Texas highway.

Police in Forney said Mr Zimmerman was stopped on Sunday, about 20 miles east of Dallas. A police dashboard video shows an officer talking to him. The officer instructed Mr Zimmerman to slow down and released him with a warning.

The officer, who was not identified, asks Mr Zimmerman, "Where you headed this weekend?" After an unintelligible response, the officer asks: "Nowhere in particular? Why you say that?"

"You didn't see my name?" Mr Zimmerman replies. "Nuh-uh," the officer says.

"What a coincidence!" the officer adds. "Are you clear of warrants and stuff?" "Absolutely sir," Mr Zimmerman says.

Mr Zimmerman then says something else unintelligible and the officer responds: "Calm down man, you're good."

The officer then tells him: "I'm going to go back (to check his licence), and why don't you slow down a little bit for me. We'll let you off with a warning."

After an unintelligible response from Mr Zimmerman, the officer says: "Just take it easy. Go ahead and shut your glove compartment. Don't play with your firearm."

Although the officer's comments indicated Mr Zimmerman had a gun, a weapon cannot be seen and it is not clear that he had one. The gun used in Trayvon Martin's shooting remains in the custody of the US government, which is looking into a possible civil rights case.

Mr Zimmerman had a concealed weapons permit in Florida that would be also recognised under Texas law.

After returning Mr Zimmerman's driving licence, the officer says: "All right, sir. Slow down." He wishes Mr Zimmerman a safe trip.

The speed limit on that stretch of road is 60mph, but police records do not show how fast Mr Zimmerman was driving, Forney city manager Brian Brooks said. Police handled Mr Zimmerman as they would have any other motorist in a comparable situation and gave him no special treatment, Mr Brooks added.

Shawn Vincent, a spokesman for Mr Zimmerman's legal team, said the lawyers had not been able to confirm the account of the police stop independently, but said he had no reason not to believe the report.

"Any time his life intersects with anyone now, somehow that's news," Mr Vincent said. "How many people, when they get a warning, become a national headline?"

Mr Vincent would not discuss what Mr Zimmerman was doing in Texas or say anything about his current location, citing safety concerns.

Mr Zimmerman's acquittal on July 13 prompted nationwide rallies calling for a civil rights probe and federal charges against him.

Last year's shooting of Trayvon, 17, in Sanford, Florida, sparked a national dialogue about equal justice, racial profiling, gun control and self-defence laws.

Protesters lashed out against police in Sanford as it took 44 days for Mr Zimmerman to be arrested. Many, including Trayvon's parents, said Mr Zimmerman had racially profiled the teenager. Mr Zimmerman identifies himself as Hispanic.

The only other time Mr Zimmerman has been seen in public since his acquittal was when he helped rescue four people from an overturned vehicle following a road accident in suburban Orlando.

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