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US Vice President Joe Biden makes a remark on the resignation of Pope Benedict XVI at the conclusion of a a roundtable discussion on gun control at Girard College in Philadelphia

U.S. Vice President Joe Biden (C) makes a remark on the resignation of Pope Benedict XVI next to Philadelphia Mayor Michael Nutter (R) and Police Commissioner Charles Ramsay (L) at the conclusion of a roundtable discussion on gun control at Girard College in Philadelphia, Pennsylvania, February 11, 2013. Biden was joined by members of law enforcement and politicians to discuss gun law reforms. REUTERS/Tim Shaffer (UNITED STATES - Tags: POLITICS CRIME LAW) - RTR3DNI7

World reacts to Pope's resignation

Pope Benedict left the Catholic world in shock after becoming the first pontiff since the Middle Ages to resign his office, saying that failing strength had left him unable to lead the church through a period of relentless change and turmoil.