On Tuesday morning, the world woke to the news that a series of deadly explosions had struck Brussels. According to reports, there were two bombings at the city’s international airport, followed by another attack in a subway station located in the heart of the Belgian capital. The attacks happened just days after a suicide bombing struck a busy shopping center in Istanbul. In what has now become a grim tradition, people around the world have taken to social media to express their sadness, fear, and solidarity with Brussels. Below, a look at how the world is reacting to the attacks.

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It’s one key piece of evidence authorities are looking at as they search for suspects after two explosions at the Brussels airport and another at a busy subway station in the Belgian capital Tuesday killed at least 30 people and wounded 230 others.

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