PITTSBURGH --

Pittsburgh police said an accelerant was used to set equipment at a Hill District playground on fire on Wednesday.

The blaze was set at about 4:30 p.m on a jungle gym at Cliffside Park along Cliff Street, officials said.

The fire then spread to a tree but was quickly put out by firefighters.

There are no damage estimates, but police believe the equipment will be expensive to repair.

So far, no arrests have been made.