A woman looks emotional as she looks at flowers left in St Ann Square on Tuesday, May 23, 2017 in Manchester,England. At least 22 people were killed in a suicide bombing at a pop concert packed with children in the northern English city of Manchester, in the worst terror incident on British soil since the London bombings of 2005.
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Manchester attack: How social media responded
01:14 - Source: CNN
CNN  — 

The first tweet came at 10:34 p.m. People in the arena thought a balloon had popped.

Minutes later, witnesses reported hearing two explosions and seeing panicked concertgoers running for safety.

And in the hours to come, as people learned more details about Monday’s deadly bombing at an Ariana Grande concert in Manchester, England, Twitter feeds reflected a looming sense of alarm, dread, horror and grief.

Here’s how it unfolded:

CNN’s Justin Lear contributed to this story.