According to the Qatari Fatwa Authority, the human body possesses dignity even after death, therefore burning the body is not permitted. An authentic hadith tells us that breaking a corpse’s bones is similar to breaking a living person’s bones.

However, the Fatwa goes on to say that if burning human bodies is medically justified (for example when there is a large number of bodies and burying them is not an option, and the spread of disease may be feared because of the decaying bodies), then it is permitted.

Source:

• Fatwa from the Qatari Fatwa Authority (Arabic PDF)