What do we know about the victims.
As noted by a commenter to the article:
In a story on the gunshop that sold the shotgun, they quote the gunshop owner saying:
“ he didnt ask about [assault] rifles; he didnt ask about handguns. He said he had a limited budget and didnt need any of that tactical stuff. — Rockville Gunshop Owner
Notice the modifying term “assault” was added by the Post even though the gun shop owner said only “rifles.”