Something was flying over Toronto on Saturday night, causing residents to contact police and take to social media with images and videos of lights in the sky.

“It was really high up, and was round, bright and shining,” Sarah Chun, who recorded videos of the lights with her iPad and posted them to YouTube, told the Toronto Star. “At first I thought it was stars or something, but it was too bright to be. I didn’t know what it was.”

Chun said the lights lasted for about 25 minutes.

"It kind of flew, and then disappeared," she was quoted as saying.

Some witnesses posted photos to Twitter, including one taken before sunset that looks more like a bird than a flying saucer. Others posted images of a mysterious light hovering over the city:

So far, no one has been able to identify the flying objects, but there's no shortage of theories.

UFOs, drones or kites What's behind these strange flashing lights spotted over North York? http://t.co/4ALmFZyuXspic.twitter.com/OeuecgaIKj — CTV Toronto (@CTVToronto) July 27, 2014

One Toronto resident told CTV he saw kids setting up a kite with a light rig attached to it.

"After it got dark, a couple of hours later, I notice a line of lights," Alejandro, who did not give a last name, told the network via email. "(It) looked like a very potent laser pointing vertical to the sky, but it was the kite these people were preparing."

Some think the lights may have been lanterns sent up for Ramadan while others, like Toronto police constable Craig Brister, believes it may have been a type of drone known as a quadcopter:

I've been a police officer for 15 years. Tonight I have a first! My first report of a UFO!! He was serious! #quadcopter — Craig 🇨🇦 (@quadcopper) July 27, 2014

Brister, who also saw the lights while on bike patrol, later told CP24 that he was only speculating.

Constable Brian Harper backs the drone theory.