FRANKFURT, Germany: German police said on Friday that they are mobilised due to a suspected hostage situation in the German city of Karlsruhe.Police in Karlsruhe had cordoned off the area because the danger level was unclear, the police said on Twitter.Reached by phone, a spokesperson did not say how many hostages there were or how long the operation had been going on.The possible hostage situation follows Thursday’s deadly rampage at a Jehovah’s Witnesses hall in Hamburg.