As a crime scene investigator you have been called to a fire in a ground floor bed-sit which apperas to have been extinguished in a radiation flashover. the fire was confined to the room of origin. the room door was closed and intact upon your arrival. Explain, with your own sketch of the bed-sit and it''s contents, in 750 words, how you would proceed to confirm from the damage in the bedsit that the fire was started with a petrol bomb in a glass container which fractured upon impact, dropped through an open sash window, which was then closed.