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TORONTO – Social media lit up Thursday evening after heavy smoke was seen wafting from the observation deck of the CN Tower.

Toronto Fire responded to reports of smoke just after 8 p.m. and quickly determined it was related to a fireworks display for the Pan Am Games, which are set to open Friday.

Pan Am spokesperson Heather Irwin confirmed that fireworks were set off from the CN Tower “as part of the dress rehearsal for the Pan Am Games Opening Ceremony.”

Photographs posted to Twitter showed smoke coming from the Toronto landmark leading many to question whether there had been a fire or an explosion.

Below are images of the event posted across social media.

THE CN TOWER IS ON FIRE pic.twitter.com/3xhmnIoieE — Just Judas (@kwitmeyer) July 10, 2015

What’s going on with the CN tower… pic.twitter.com/wt2pUUcbwK — Kaitlin Ross (@kaitlinross) July 10, 2015

Is the CN Tower on fire? pic.twitter.com/nl1e6X1VVa — Sebastiana Spataro (@Sebastiana_24) July 10, 2015

CN Tower is smoking. Really hope everyone is ok. #Toronto pic.twitter.com/SrhwL7c8Pe — Kristina Breckon (@KristinaBreckon) July 10, 2015

This just in: TORONTO IS NOT UNDER ATTACK it’s just getting ready for #PanAm #CNtower pic.twitter.com/UkvwAv6WHb — Cynthia Yan (@yannypack) July 10, 2015

https://twitter.com/princessa_the1/status/619298091162664960/photo/1

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https://twitter.com/PhMai/status/619297841123606530/photo/1

https://twitter.com/RachelScottYoga/status/619301240380485632/photo/1

https://twitter.com/kwdonovan/status/619302819946987521/photo/1