Dr Kenneth Berry, a bioterrorism expert whose houses and car are being searched by the FBI, was involved in a bizarre incident last Thursday when he attacked a teenage girl, apparently quite violently, at a motel near his home.

An off-duty policewoman, Elizabeth Goeckel, who saw the whole thing, said "I'd just finished checking in and I heard screaming. A teenage girl was running into the lobby and a man was chasing her.

"He was hitting her and she was screaming for help. Then he tackled her onto the ground, and I went over and grabbed his arm so she could get out from under him.

"She was fighting to get away. I told her to just go outside, and that's when I used force to restrain him with the help of a man from the motel.

"A woman ran in - his girlfriend or wife - screaming that he had just thrown her and her child down into the street."

Dr. Berry was charged with four counts of assault.

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