It was bizarre, to be sure, when several people reported hearing an explosion in Mission Hill Monday night. It turned out to be an aggressive two-alarm fire on the roof deck of an apartment building.

There’s often a lot of confusion in the early moments of a big fire or emergency. But it takes a special kind of mind to jump from “Some people heard an explosion” and “Is there a fire?” to “Oh my God, the terrorists are attacking us.”

Some Twitter users were ready to make that leap:

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Thankfully, Boston’s twitterverse is also full of level-headed people who swatted back the speculation.