Theatre-goer Dee Kearney was watching The Curious Incident of the Dog in the Night-Time when actors from the show told the audience to "Watch out!"
Then what we felt was debris falling on us, a loud bang, and then all of a sudden there was a coat of dust that came on us.
It was a thick cloud of dust, so you couldn't actually tell what was happening. You knew it was coming from above but you didn't know what was actually happening.
More top news
The signs were encouraging to commuters going about the transport network the day after a terror attack in Westminster.
Faith leaders from across London say religious communities will "stand together" in the wake of the Westminster terror attack.
Pc Keith Palmer was among the three people killed yesterday in the Westminster terror attack.