New images were released about the US attack on the Abu Bakr al Baghdadi complex, during which the IS leader exploded.
Grainy black-and-white videos show US forces approaching property in Syria.
They also reveal a huge cloud of smoke when the compost was destroyed when they were finished.
US forces approaching Abu Bakr al Baghdadi complex. Pic: US Government
US Central Command chief Gen. Frank McKenzie said US forces "discovered Baghdadi hiding in a tunnel."
"When capture by US forces was imminent, Baghdadi detonated a bomb he used, killing himself and two small children who were with him. Originally, we thought there were three children with him."
Another five IS members "posed a threat to the force," Gen. McKenzie said, and "did not respond to requests in Arabic for surrender."
General McKenzie added during a Pentagon meeting that they were "involved in the attack force and killed."
There were four women and one man.
Abu Bakr al Baghdadi became a feared hate preacher
"Following the killing and suicide of Baghdadi, our assault force removed significant debris from the tunnel and secured Baghdadi's remains for confirmation of identity," Gen. McKenzie said.
"The remains of Baghdadi were buried at sea according to the armed conflict law within 24 hours of his death.
"The assault force secured any documentation and electronics we could find, which was substantial."
Noncombatants, including 11 children, were "detained and released," said Gen. McKenzie.