A bomb was defused in Norway’s capital city of Oslo late Saturday night, and a suspect was arrested. The incident caused local bars and restaurants to close down as authorities worked to neutralize the explosive, which was placed at a busy subway station. European nations are on high alert following a string of deadly attacks in St. Petersburg, Russia, and Stockholm, Sweden, in the past week alone. Norway’s security service, PST, took over the investigation. Officials declined to elaborate on the suspect or the device that was neutralized.