CHAIRPERSON
I suppose it depends, Mr Nel, on the limpet mine.  Aren't they usually devices that can be timed, it depends where it was put, what time it was set off to go, if it was put on the police station it could be set of to go off to go at 3 in the morning or it could be - on the other hand it could be set off to go mid afternoon in a very busy place, we don't know that but perhaps if the witness can answer your question, see if he knew where it was to be set precisely and when it was to go off.