Laurel, Md. (WUSA9) -- Discovery Community Park reopened after a fire that could be the work of an arsonist.
Prince George's County Fire Investigators still do not know who started the park fire three months ago, but say that it could have been a serial arsonist responsible for several fires in Laurel.
There have been nine fires in Laurel since January, eight of them in the last three months.
Just three days after the fire at Discovery Community Park, someone set a two-alarm fire at the Laurel Fuel Oil building. Five days after that, there was another playground fire at the Emancipation Community Park.
Just last Thursday, there was a third playground fire on Bowsprit Lane, and less than 12 hours later, another fire was set at the former Bay 'N Surf Restaurant.
The arsonist could be targeting parks, playgrounds, and businesses that are either empty or closed, police say.
No one has been injured in any of these fires, but the Prince George's County Fire Department is worried that it's only a matter of time.
Two juveniles have been arrested and charged with arson in connection with a fire at Granville Guide Park, police say.
The case remains open for the other eight fires.
The City of Laurel posted a reward of up to $10,000 for anyone that provides information that leads to the arrest and conviction of whoever may be responsible for the fires.
If you have information, call the Arson Tip Line at 301-77-ARSON (311-772-7766)