Online posts thought to be authored by the alleged Buffalo shooter show how he might have attacked spots in Rochester.

As the city of Buffalo reeled from the racist massacre at a Tops supermarket, word spread swiftly on social media in Rochester on Monday that the suspected gunman had considered attacking a variety of targets here. Circulated widely were screenshots of posts from the online message platform Discord that offered specific details on how the author of the posts would carry out attacks at locations that local law enforcement officials said they believed were in Rochester.…