PORTLAND, Maine — There’s something brewing in Maine’s largest city — and it doesn’t smell good. On Thursday, CBS 13 received dozens of comments online from people who wanted to know, “What’s that smell?”

People say the stench smells like trash, burned coffee, and … other things we can’t type here. CBS 13 talked to police and the city spokesperson, they all told us they didn’t know what the mystery smell was.

There are so many comments about it on Twitter, the city’s official account tweeted out a reply Thursday, saying they don’t know yet where the smell is coming from.