Portal to Hell? Spooky Black Smoke Ring in Sky Over Vietnam Baffles Social Media Users – Video

A video of an eerie black smoke ring in the sky has created a lot of buzz online as netizens flood social media speculating on what it could be.
Sputnik
A mysterious black smoke ring floating in the sky over Vietnam has caught the attention of the netizens after a video of it went viral on social media.
While some are calling it just a puff from a smoke machine or firework, others suggested it could be a "portal to hell," or witchcraft.
Back in 2013, a similar black smoke ring appeared in the sky over Florida, US. It occurred due to a pyrotechnic test.
Another identical smoke ring was sighted over Chicago in 2012 that appeared after an electrical transformer blew up.
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