Any spark might set off an explosion powerful enough to destroy the house.

India set off a nuclear explosion in 1974; Pakistan has never taken this step.

He would set off an explosion that loosened the ground under Thomas.

No political decision is made in Russia without setting off an explosion of conspiracy theories.

That set off an explosion of thoughts inside Croft's head.

His every movement seemed to set off an explosion of echoes.

He fully expected that the terrible news would set off an explosion of hysteria.

That was the final spark to set off an explosion.

Early Saturday morning, someone apparently set off a small explosion in front of the house to emphasize the point.