Airports around the world are tightening security after two explosions hit the departure area of Belgium's Zaventem airport and a third rocked a metro station in central Brussels early Tuesday, reportedly the work of suicide bombers. Flights at Brussels airport were canceled immediately and the airport will remain closed until at least 6 a.m. Wednesday. Around Europe, security was tightened at Frankfurt Airport, London Heathrow, London Gatwick, and at all Italian airports. In New York, police are increasing their presence at airports, train stations, and major city landmarks.
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