What is happening?

What to do

1. Leave if possible. With no exit during the explosion, shelter under a sturdy table if within reach.
2. Trapped: move little. Cloth over nose/mouth. Signal by tapping pipe/wall or with a whistle.
3. Child/person needing assistance: accompany only along safe exit, no re-entry. Unable to escape: give exact location/mobility to rescue. No improvised rope/unsafe stair carrying.
4. After explosion: breathlessness, chest pain, confusion, bleeding or burn: medical emergency. Report exposure even without visible wound. Without new danger, do not move injured person except lifesaving care.