A fire was reported at Laurel's Emancipation Park Monday around 4:30 p.m., making it the third fire at a Laurel playground in little more than a week.
Laurel city spokesman Pete Piringer estimates the fire caused $80,000 to $100,000 in damage. No injuries were reported.
Piringer said the city is offering a reward of up to $5,000 for information that leads to an arrest and conviction in connection with the fire.
Several Laurel residents saw the fire and called Laurel Police. A reporter on the scene around 5:30 p.m. said the air smelled like burnt plastic.
After the fire was knocked out, wooden structures at the playground were still standing but plastic parts of the equipment were burned off.
Piringer said there are "obvious similarities" between Monday's fire and the two previous fires at Granville Gude Park on Friday and Discovery Park last week, but that investigators are working to determine if they are related.
Piringer said investigators are also looking into available surveillance video and if there were any witnesses who could provide information.
Anyone with information on the three fires can call the Laurel Police Department's tip line at 301-498-7645.
Check back for updates.
Baltimore Sun Media Group reporter Luke Lavoie contributed to this report.