WASHINGTON >> The general who oversaw the U.S. raid on Islamic State leader Abu Bakr al-Baghdadi provided the most detailed account yet of the operation today and said the U.S. is on alert for possible “retribution attacks” by extremists.

Gen. Kenneth “Frank” McKenzie, head of U.S. Central Command, said al-Baghdadi’s remains were buried at sea within 24 hours of his death inside an underground tunnel where he fled as special operations soldiers closed in on him.

The Pentagon released the first government photos and video clips of the nighttime operation, including one showing Delta Force commandos approaching the walls of the compound in which al-Baghdadi and others were found.

Another video showed American airstrikes on other militants who fired at helicopters carrying soldiers to the compound. The U.S. also bombed the compound after the soldiers completed the mission so that it would not stand as a shrine to al-Baghdadi.

“It looks pretty much like a parking lot with large potholes right now,” McKenzie said.

The attacking American force launched from an undisclosed location inside Syria for the one-hour helicopter ride to the compound, McKenzie said.

Two children died with al-Baghdadi when he detonated a bomb vest, McKenzie said, adding that this was one fewer than originally reported. He said the children appeared to be under the age of 12. Eleven other children were escorted from the site unharmed. Four women and two men who were wearing suicide vests and refused to surrender inside the compound were killed, McKenzie said.

The general said the military dog that was injured during the raid is a four-year veteran with U.S. Special Operations Command and had been on approximately 50 combat missions.

The dog, a male whose name has not been released because the mission was classified, was injured when he came in contact with exposed live electrical cables in the tunnel after al-Baghdadi detonated his vest, McKenzie said. He said the dog has returned to duty.

Baghdadi was identified by comparing his DNA to a sample collected in 2004 by U.S. forces in Iraq, where he had been detained.

The U.S. managed to collect “substantial” amounts of documentation and electronics during the raid, McKenzie said, but he would not elaborate. Such efforts are a standard feature of raids against high-level extremist targets and can be useful in learning more about the group’s plans.

Although the raid was successful, McKenzie said it would be a mistake to conclude that the Islamic State has been defeated.

“It will take them some time to re-establish someone to lead the organization, and during that period of time their actions may be a little bit disjointed,” the general said. “They will be dangerous. We suspect they will try some form of retribution attack, and we are postured and prepared for that.”

In outlining the operation, McKenzie said al-Baghdadi had been at the compound in Syria’s northwest Idlib province for “a considerable period,” but he was not specific.

He said the raid was briefed to President Donald Trump on Friday, and McKenzie made the decision to go ahead on Saturday morning.

McKenzie offered no new details about al-Baghdadi’s final moments.

“He crawled into a hole with two small children and blew himself up while his people stayed on the grounds,” he said when asked by a reporter about al-Baghdadi’s last moments and Trump’s description of the Islamic State leader as “whimpering and crying and screaming all the way” to his death.

Other senior Pentagon officials, including Gen. Mark Milley, chairman of the Joint Chiefs of Staff, have said they could not confirm Trump’s description.

Several times this month, President Donald Trump has said he is withdrawing from Syria and that the troops are “coming home.” But, in fact, the U.S. military remains in the country, shifting positions and gearing up to execute Trump’s order to secure Syria’s oil fields — not for the Syrian government but for the Kurds. Trump also has said he wants to “keep” the oil, although it’s unclear what he means.

Earlier today, the acting homeland security secretary, Kevin McAleenan, told a congressional hearing that U.S. security agencies have been reminded of the potential for al-Baghdadi’s death to inspire his followers to launch an attack “in the immediate aftermath.”

Russell Travers, the acting director of the National Counterterrorism Center, told the same hearing that he does not believe al-Baghdadi’s death will have “much impact” on the organization.

“If there were significant attacks that were in the planning, that planning will continue. It won’t have that much effect,” Travers aid.

Within Syria and Iraq, he added, IS has at least 14,000 fighters.

“That’s an important number,” he said. “Because five, six years ago, when ISIS was at its low point, they were down under a thousand. To us, this tells us the insurgency has a lot of options.”

FBI Director Chris Wray said the biggest concern in the United States was the “virtual caliphate” that inspires Americans to pledge allegiance to IS and commit acts of violence in the group’s name even without traveling to Syria.

Rep. Bennie G. Thompson, a Mississippi Democrat and chairman of the House Homeland Security Committee, said he worries that despite al-Baghdadi’s death, the conditions in Syria “are ripe for ISIS to reconstitute.”