Why was the dead body of Saul cremated?

We read in 1 Samuel 31 how Saul, his sons and generals killed themselves rather than surrender to Philistines. The valiant men of Israel retrieved their dead bodies ,burned them and buried the bones under a tamarisk tree in Jabesh. Elsewhere, we see prominent men of Israel getting buried on their death. It is not clear why Israelites chose to cremate the dead body of Saul. What explanation do scholars offer for the same ? Inputs from any denomination are welcome.