An FBI counter terrorism supervisor is currently under an internal investigation after a night of heavy drinking with exotic dancers led to his gun being stolen, new documents reveal.

Robert Manson was drinking heavily in a fifth-floor room in the Westin Charlotte hotel in the North Carolina city when his gun, $6,000 Rolex and some cash were stolen from him, a Charlotte- Mecklenberg police report says.

Manson, who is a unit chief in the FBI's international terrorism sector, was heavily intoxicated but uninjured when police were told of the incident, the New York Times reported.

The agent was visiting Charlotte on July 9 for training, and agents told police they'd spent that night drinking with women they believe were exotic dancers.

Robert Manson was drinking heavily in a fifth-floor room in the Westin Charlotte hotel (pictured) in the North Carolina city when his gun, $6,000 Rolex and some cash were stolen from him, a Charlotte- Mecklenberg police report says

Officers responded to a 911 call around 6.30 on July 10 from Manson's peers, as he was still too incapacitated to make the call himself. Fellow agent Kevin Thurman is listed as filing the report on Manson's behalf.

Police believe the theft happened sometime between 2 and 5am - after the hotel bar was closed.

Spokesman for the Charlotte-Mecklenberg Police Department Robert Rufano said the gun was a Glock, and that it is still missing.

'Investigators determined the victim, Robert Manson, met a woman in the hotel bar the prior night and took her back to his hotel room,' Tufano told Fox News.

'Mr Manson identified himself as a Special Agent with the Federal Bureau of Investigation.'

Spokesman for the Charlotte-Mecklenberg Police Department Robert Rufano said the gun was a Glock, and that it is still missing (STOCK IMAGE)

Manson's job within the FBI is to oversee all terrorism investigations in the Midwest and the Carolinas

So far no arrests have been made in relation to the crime, and Manson hasn't been suspended as a result of the internal investigation.

His job within the FBI is to oversee all terrorism investigations in the Midwest and the Carolinas.

It's not clear where Manson had his firearm in his hotel room, but the FBI tells agents they cannot leave weapons unsecured.