Ahead of poll closures in Pennsylvania, former President Donald Trump said on his social media platform that there was “talk about massive cheating in Philadelphia” and said law enforcement was on the way.

He did not provide details, and there was no immediate indication of what he was referring to, and his spokespeople did not respond to requests for comment about what he meant.

Election Day voting had proceeded relatively smoothly across Pennsylvania, with a few counties reporting problems with ballot tabulators.

Philadelphia District Attorney Larry Krasner issued a statement responding to Trump’s post, saying the only suggestion of cheating was coming from the Republican presidential nominee.

“There is no factual basis whatsoever within law enforcement to support this wild allegation,” Krasner said. “We have invited complaints and allegations of improprieties all day. If Donald J. Trump has any facts to support his wild allegations, we want them now. Right now. We are not holding our breath.”

Read more about voting in Pennsylvania.