INDIANAPOLIS -- A former Kokomo High School swim coach accused of secretly videotaping girls as they undressed in a locker room has been indicted on charges including distribution of child pornography.

A federal grand jury on Wednesday indicted Brian Hindson, 40, on three counts of production of child pornography, four counts of distributing child pornography and a count of child pornography possession.

Authorities have said they believe Hindson produced three videos of teenage girls undressing in a locker room of the Kokomo Memorial Gym between 2005 and 2007, while he was the girls' and boys' swim coach at Kokomo High.

The indictment alleges Hindson, of Westfield, distributed images of some of the girls. The indictment doesn't say how or to whom those images were distributed, said Timothy M. Morrison, acting U.S. attorney for the southern district of Indiana.

The possession charge alleges images of some of those girls and of other minors from Internet sources were found in an external hard drive that authorities found in Hindson's home in February. Previously, authorities said images on that drive were not linked to local minors.

Morrison said the investigation of Hindson is not finished.

According to a probable cause affidavit previously released in the case, three girls were taped at the Kokomo locker room, and each video shows one girl. One of the videos appeared to have been produced with a camera hidden in a locker, and the other two appeared to have been produced by a person in an office next to the locker room, holding a handheld camera at a vent of a door separating the two rooms, the affidavit said.

An FBI investigation began in March 2006, when two people in North Carolina told the agency they found two videos -- showing what appeared to be a high school female in a locker room changing out of a bathing suit -- on a computer that Hindson had sold them on eBay, according to the affidavit.

The FBI could not find the videos when it examined the computer, but it did find images of "two young females posing in a shower," the affidavit said.

On Jan. 29, the FBI's division in Charlotte, N.C., gave the information to the FBI's Indianapolis division, which talked to Kokomo police, leading to Hindson's arrest in February.

Hindson admitted to investigators that he hid video cameras in locker rooms at Kokomo and Westfield high schools, authorities said.

Besides being the KHS swim coach, he led the Westfield-based Central Indiana Aquatics swim club. KHS fired him in February.

If he is convicted of all charges, Hindson could receive a prison sentence of up to 180 years.