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.