More than 25 people are reported dead after explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe.
European security officials have been bracing for a major attack for weeks, and warned that the Islamic State group was actively preparing to strike.
The arrest Friday of a key suspect in the November attacks in Paris heightened those fears, as investigators said many more people were involved than originally thought, and that some are still on the loose.
Here is how the attacks have been linked:
Nov. 13, 2015: About 130 people are killed and hundreds more injured as a series of explosions rock Paris in the worst terrorist assault on Europe in a decade. A number of restaurants, the Bataclan concert hall and the Stade de France are targeted.
Nov. 18, 2015: Abdelhamid Abaaoud, 27, suspected of masterminding the deadly attacks in Paris, dies along with his female cousin in a police raid in the Paris suburb of Saint-Denis. A third body is later found and eight people are detained.
March 22, 2016: Just days after Abdeslam is captured, Brussels is hit by attacks on Zaventem airport and the city's subway system, near a station close to European Union buildings.
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