BALTIMORE (AP) — Authorities say they are conducting an arson investigation at the Maryland Board of Nursing offices in Baltimore.

The Maryland State Fire Marshal’s office says security officers patrolling early Thursday found a small fire in the office on Patterson Avenue and extinguished it, but didn’t call fire or police. When workers arrived at the offices later that morning, they found the remains of other small fires that went out on their own and contacted the fire department.

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The fire marshal’s office says investigators determined that the fires were arson.

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No motive or suspects were identified.

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