FREDERICK, Md. (AP) - Frederick County fire investigators are looking into three separate fires, including a car that was intentionally set ablaze in a motel parking lot.

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The county fire marshal's office says the fires occurred during a span of six hours.

The first happened late Friday night in Emmitsburg, where a detached garage caught fire. The cause is undetermined.

The burning vehicle was found early Saturday morning in the parking lot at the Travelodge in Frederick. Investigators determined it was a case of arson.

The third fire was accidental and damaged a house in Frederick. No one was injured.