The resignation and fear expressed by the Senior Fellow at the German Institute for International and Security Affairs ( SWP ) is similar to that of diplomats , intelligence analysts and police officials also interviewed by CBS News . Facing distinct concerns over immigration , a poorly equipped police force and the simultaneous threats of unsecured nuclear material and porous borders , German cities are bracing for a terror attack . " We are as vulnerable as Brussels , " said Kaim , of the SWP , a think tank that advises contact.requestadvise.meet the government and Germany 's parliament in Berlin . " We are as vulnerable as Paris . We are as vulnerable as London . "