The state fire marshal's office and Maryland State Police are investigating a series of arsons in the Gamber area.
Firefighters responded at 4:06 a.m. yesterday to a mailbox on fire and three pine brush fires in the Deer Park Estates subdivision. Ten firefighters worked 30 minutes to control the fires.
A passer-by discovered the fires, said deputies from the fire marshal's office, who determined that all four fires were incendiary.
Damage to the mailbox was estimated at $35. No other structures were damaged in the fires.
The fire marshal's office is asking anyone with information about the fires to call the Arson Hotline at 800-492-7529.