Including/especially American military personnel. The G8 summit is being hosted in Germany next month and the cops already have their hands full with expected left-wing terrorism, so jihadis might be trying to capitalize on their distraction, and of course on the extra media attention and symbolic value that would come with an attack during a local gathering of western world leaders.

Sounds serious:

U.S. and German officials fear terrorists are in the final planning stages of an attack on U.S. military personnel or tourists in Germany.

Law enforcement officials tell the Blotter on ABCNews.com that U.S. air marshals have been diverted to provide expanded protection of flights between Germany and the United States.

“The information behind the threat is very real,” a senior U.S. official told ABC News…

Security at all U.S. military and diplomatic facilities has been increased in the last month, following reports that suspected terrorists had conducted surveillance of the Patch Barracks facility.

No one quoted in the piece explicitly identifies the threat as coming from Muslims, but the German Interior Minister strongly implies it and the background provided by the Blotter suggests they’re reasonably sure. Memory-freshening exit question: The London bombings happened on July 7, 2005. When and where was the G8 summit hosted that year?

Update: See-Dubya points me to this Deutsche Welle article from a few weeks ago identifying a threat to U.S. interests in Germany from Ansar al-Sunna, one of the most notoriously vicious jihadist groups in Iraq.