Murder committed in the service of piracy is pretty much the definition of hostis humani generis (enemies of humanity).
From the Los Angeles Times:
Somali pirates shoot two couples, from California and Seattle, who had been on an around-the-world sailing trip when they were taken hostage off of Oman....MOREUpdate: I decided to repost a story from last year:
"Dealing with Pirates (and terrorists) Russian Style"
