Aslam

Praise be to Allah.If

the accident is major and serious, then it is OK to stop one’s prayer;

if it is a minor incident that can be dealt with after completing the

prayer, then it is not permissible. The scholars said: it is obligatory to

stop one's prayer in order to save a negligent person from a fatal

accident. For example, if you are praying and you see a snake approaching

a man who is sitting down and has not noticed it. If it is heading for

him, you have to stop your prayer and tell him so that he will not be

bitten, possibly fatally. Or if you see a blind man walking in front of

you whilst you are praying, and he is heading towards a well, and you are

afraid that he may fall into it, then you have to stop your prayer and

save him from that fatal accident, even if this means stopping your

prayer. The same applies in cases of fire, etc.

But

if the siren goes off for a minor matter which can be dealt with after

completing the prayer and it will not be too late if you complete the

prayer first, then it is not permissible to stop your prayer before you

have completed it, because this accident can be dealt with after

completing the prayer, without anyone coming to further harm. And Allaah

knows best.