Every now and again I'm browsing through the web when I come across another story like this, about two elderly people who were accidentally killed when a drug raid went bad. Police set off flash charges and started a fire. The couple were killed in bed by smoke inhalation. The cops were looking for someone else, and claimed they didn't know innocent people were present.
This happened in 1989, so it hadn't been included yet in my Drug War Bystander casualty count, which now stands at 23 killed and four wounded.