What is the reason for considering those who die by burning and demolition as martyrs, as indicated by the Prophet, may God's prayers and peace be upon him?

The martyrs are seven: the one who dies of plague, the one who dies of an internal disease, the one who drowns, the one who dies under a collapsed building, the one who dies in a fire, the one who dies of pleurisy, and the woman who dies during childbirth, in addition to the martyr in the cause of Allah, the Mighty and Exalted. These are not the same as the one killed in the cause of Allah; they receive the reward of martyrs in the Hereafter, and they are washed and prayed over in this world.