Flashing lights above the Gateway Arch in St. Louis have left sky watchers perplexed.

Surveillance video posted to Facebook by Malcom W. Martin Memorial Park shows the light appearing in the sky, then flying over the arch between 2:30. and 3 a.m. local time on Tuesday.

The National Park Service told KTVI that there were no reports of strange flights that morning. The local Air Force base had no reports of anything out of the ordinary or any phone calls about the strange lights.

Chase Rhoads also captured video of the light from a different location. He shared his video with KTVI.