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(NewsNation) — A Boeing pilot recorded strange lights in the sky during a flight from Saudi Arabia to Nigeria that the pilot said did not show up on radar.

Captain Ruud Van Pangemanan uploaded the video to YouTube, capturing lights hovering outside the cockpit of the Boeing 747.

Pangemanan said the lights appeared around 30 minutes into the flight and described them as moving freely and extremely bright. He also said they did not appear on radar.

The captain said it was a strange experience and described the lights as UFOs.

There are possible mundane explanations, including satellites, stars or planets. The lights could also be ball lightning, a phenomenon that consists of balls of light seen in the sky, often in association with thunderstorms.

It’s also possible the lights are connected to the Perseid meteor shower, which is happening this month and sending hundreds of shooting stars through the atmosphere.

Pangemanan has said he doesn’t believe the lights were stars or satellites, citing the way the lights behaved.