Police launched an investigation after Rheinmetall cars were set on fire, reports Deutschlandfunk. Three vehicles were destroyed at the security concern's site at Kassel-Kelden Airport. Responsibility for this was taken by left-wing radicals who published a statement on the Internet, according to an article on a German portal. Law enforcement officers are coming off a version of arson. Hesse's interior minister, Roman Fuzek, called the incident a targeted attack. Rheinmetall planned to locate logistics and training units there, as well as a UAV testing center.