An explosion caused the partial collapse of a bridge linking the Crimean Peninsula with Russia on Saturday, damaging a key supply artery for the Kremlin's faltering war effort in southern Ukraine. Russian authorities said a truck bomb caused the blast and that three people were killed. Images on social media Saturday showed the Kerch Bridge, which has train and automobile sections, in flames. The railway bridge was ablaze and a section of the parallel road bridge collapsed into the sea. The bombing came a day after Russian President Vladimir Putin turned 70, dealing him a humiliating blow that could lead him to up the ante in his war on Ukraine. One military analyst called it a punch in the face for Putin on his birthday, CBS News' Charlie D'Agata reports. Russian President Vladimir Putin signed a decree late Saturday tightening security for the Kerch Bridge and for energy infrastructure between Crimea and Russia. Russia's federal security service, the FSB, was put in charge of the eff
