Alex Puhakka-Laitinen and Anneli Puhakka were sitting in their apartment when the explosion in central Enköping occurred.
– There was a huge pulse, you were both scared and worried, says Anneli.
Alex continues:
– All of a sudden we felt the whole building just shake, and heard the world crash.
They ran out onto the balcony, called 112 and filmed what happened – see in the player above