They are willing to take a risk - trigger an explosion.
Times,Sunday Times
That mixture was inserted into a modified torch bulb to trigger the explosion.
The Sun
An electrical spark could trigger an explosion.
Times,Sunday Times
But sunny days and chilly nights could trigger an explosion of brilliant tree leaf colours as autumn finally appears.
Times, Sunday Times
The devices were in place, the mobile phones in hand to trigger the explosion - but it looks as if the final piece in the jigsaw failed to fall into place.
Times, Sunday Times