Croatian authorities halted traffic, blasted emergency sirens and evacuated part of the historic port city of Rijeka on Sunday so they could detonate a massive Nazi ship mine found still buried in the seabed. Croatian police released videos of the complex and dangerous operation that showed divers fixing straps to the 1,500-pound piece of aged World War II ordnance so it could be moved. Another video showed the distant explosion of the device that sent a tremendous plume of seawater skyward. The anti-ship mine was found in June near the port on the Adriatic Sea. Officials moved it further away...