Brussels' mayor has canceled the Belgian capital's annual New Year's Eve celebration because of a terror threat as several cities around the world ramped up security.
Speaking to Belgian broadcasters, Mayor Yvan Mayeur said that according to a crisis center analysis it would not be possible to screen the tens of thousands of people who were expected to turn out for fireworks and other festivities.
Paris has tightened security, but says it will proceed with its New Year's Eve celebration.
Paris Mayor Anne Hidalgo told a French publication that France needs its symbolic passage into the new year, to "send a signal to the world" as it continues to recover from the attacks.
Meanwhile, thousands of police officers, some armed with long guns, radiation detectors and bomb-sniffing dogs, will be guarding the massive New Year's celebration in New York City's Times Square.