Crowd gathers for heart-wrenching rendition of 'Imagine' after attacks on Brussels

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As people tried to come to terms with Tuesday's suicide bomb attacks in Belgium, a crowd that had gathered to grieve in central Brussels broke into an impromptu performance of John Lennon's "Imagine."

Gathered in a circle, with arms wrapped around one another, a small group started to sing Lennon's well-known peace anthem Tuesday night in the capital city's Place de la Bourse. Soon, more voices from the crowd joined in.

Earlier Tuesday, people used chalk to write messages of grief and hope in the streets, including the square.

"Pray for Belgium," one message said. "Islam -- it's not terrorism," another said.