Washington police say a severed thumb found at a robbery scene was a perfect fit with a nine-fingered suspect who showed up at a hospital.

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Byran Perez was arrested at the emergency room of a District of Columbia hospital where he had gone shortly after he and another man had allegedly robbed a suspected bordello in the city's Columbia Heights neighborhood.

Detectives found the thumb at the scene and determined that one of the bandits must have been shot in the hand.

The Washington Examiner Wednesday said officers took a print of the thumb and then hustled over to Washington Adventist Hospital where they matched up the severed digit with Perez's bloody hand.

"It fits like a puzzle piece," Dr. Erin Smith told police, the arrest affidavit said.

Perez was taken to a Baltimore hospital where the thumb was reattached. He was still in jail Wednesday on a burglary-while-armed charge.