WILLOUGHBY, Ohio - A Willoughby police officer on Wednesday thwarted three suspects' attempt to rob a credit union with a semi-automatic rifle, police said.

No one was harmed in the attempted robbery that happened just before 10 a.m. at WES Credit Union on Clark Avenue at Second Street, police said in a news release.

Two suspects were arrested when they ran from the credit union, and a third was taken into custody when he was spotted nearby, police said.

Arvis Williams, 20, of Cleveland, Melvin Hill, 20, of Cleveland, and a 16-year-old Cleveland Heights boy are charged with aggravated robbery and possessing criminal tools, police said.

Williams and Hill are being held on $500,000 bond at the Lake County Jail. They are scheduled to appear at preliminary hearings Oct. 19 in Willoughby Municipal Court, records show.

The 16-year-old boy is in custody at the Lake County Juvenile Detention Center, police said.

The credit union hired the Willoughby police officer in the wake of a Sept. 7 robbery. Police did not say whether investigators believe there are any connections between the earlier robbery and this most recent attempt.

Two suspects - later identified as Williams and the 16-year-old boy - walked in with a Smith & Wesson MP-15 rifle, police said. The officer drew his handgun and ordered the suspect who was holding the semi-automatic rifle to drop it, police said.

The suspects dropped the rifle as they ran, police said.

The officer chased them down Clark Avenue until more police officers arrived to set up a perimeter cutting off their escape. Williams and the 16-year-old boy were found minutes later in a backyard on Sharpe Avenue, police said.

Hill was spotted while he was driving a silver Ford Fusion that is registered to Williams. Hill parked the car on Clark Avenue, and officers arrested him when he walked by the credit union, police said.

The FBI assisted in the investigation.

Detectives are trying to determine whether Williams, Hill and the teen are connected to any other robberies in the area, police said Wednesday.

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