New Orleans has always been a hotbed of mystic activity. After Katrina hit, so many wards, charms, holy places and totems have been washed away, allowing forces long kept out or dormant to start showing their heads again. And just because the bodies are drained of blood may or may not be vampiric, it might be indicative of a dark ritual of some kind. I've never met them, but I know of some people through reputation down there that might help. Look for Mama Annalee, a Voodoo Priestess known as a Mambo. There's also a man named Gitani Romanov, the guy's a manufacturer of specialized armors and weapons. If you need help, contact them.

I think Reckoner's on the right track. There's more than just vampires that drain blood as a modus operandi. I've heard succubi drink it, too.

A "lazlo society business card?"

Does lazlo even have one of those?

I have a few more pals that owe me one that take their bread and breakfasts over there. Maybe I can give'em a call?

This is going to sound like a weird question, but if you can examine debris or the blast site, does the explosion look like it happened from the outside in, or inside out? And a friend of mine says that just because there may be traces of sulphur there MAY or MAY NOT indicate an explosive or accelerant. It sounds like something was placed somewhere and not meant to easily be recovered.

Sulphur does lower activation energy, which makes it attractive to use in explosives. But you're correct that it can be present for other reasons.