Explosions tore through the departure hall of Brussels Airport on Tuesday morning, killing at least 17 people and injuring dozens of others, Belgian news agency Belga and local sources have said.
According to Belga, shots were fired and Arabic shouts were heard shortly before the explosions.
The blasts occurred four days after the arrest in Brussels of a suspected participant in November militant attacks in Paris that killed 130 people. Belgian police had been on alert for any reprisal action.
Social media showed pictures of smoke rising from the departure hall where windows had been shattered by the blasts. Passengers were seen running away down a slipway.
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Meanwhile, Brussels Airport authorities have been constantly issuing warnings in the aftermath:
As evacuation efforts were underway at the Brussels Airport, another explosion rocked the Belgian capital: