This post has been updated.
The Philadelphia Police Department's Bomb Squad was called to Citizen's Bank Park this morning after a maintenance worker reported hearing an explosion while he was mowing the grounds, according to police.
The explosion was declared unfounded. A police spokeswoman said unexploded fireworks were found at the ballpark, but a Phillies spokeswoman denied those reports in a written statement this afternoon.
Around 9:45 a.m., the worker was mowing at a PECO substation next to Lot Q when he reported hearing an explosion coming from underground, police said. The bomb squad was called out at 10:08 a.m. and quickly placed the situation under control.