London attack calls for joint fight against terror

Whether or not the Islamic State terrorist group was behind the bloodshed outside the British Parliament, the act of terror again underlines the pressing need for a response that goes beyond a case-by-case approach.

This is not the first attack of its kind on British soil. Nor in Europe. Less than a week ago, a lesser, abortive attack by a lone-wolf terrorist occurred in France, and several other attacks have taken place, or were foiled recently.

Europe faces a clear and present danger. But terrorism is not just Europe's problem. Nor can Europe fight it on its own.