US President Donald Trump said on Monday he may declassify and release part of the video taken on Saturday of the raid in Syria in which Islamic State leader Abu Bakr al-Baghdadi was killed.

The video is believed to include aerial footage and possibly footage from cameras mounted on the soldiers who stormed Baghdadi’s compound.

We’re thinking about it. We may, Trump told reporters before flying to Chicago. We may take certain parts of it and release it.

Trump said on Sunday that Baghdadi had died whimpering and crying in a raid by U.S. special forces in Syria, fulfilling his top national security goal.

World leaders appreciated death of Baghdadi but said the campaign against Islamic State, a group that carried out atrocities in the name of a fanatical version of Islam, was not over, with so-called lone wolves likely to seek revenge.

Trump in a televised address from the White House, narrated how the raid and killing took place.

He was a sick and depraved man and now he’s gone, said Trump. He died … whimpering and crying and screaming.

Kremlin spokesman Dmitry Peskov declined to say if the United States had told Russia about the operation in advance.

But he added: If this information is confirmed we can talk about a serious contribution by the president of the United States to the fight against international terrorism.

French President Emmanuel Macron said Baghdadi’s death was a major blow against Islamic State but the fight continues to finally defeat this terrorist organization.

British Prime Minister Boris Johnson said: We will work with our coalition partners to bring an end to the murderous, barbaric activities of Daesh (Islamic State) once and for all.

Australian Prime Minister Scott Morrison told reporters: This is a many-headed monster … As you cut one off, another one inevitably arises.

In Southeast Asia, an important focus for Islamic State, officials said security forces were preparing for a long battle to thwart the group’s ideology.

The Philippines, Indonesia and Malaysia, home to some of Asia’s most organized Islamist militants, said they were braced for retaliation by Islamic State loyalists, including lone wolf attacks by radicalized locals.

Though Baghdadi’s death will unsettle Islamic State, it remains capable and dangerous, said Delfin Lorenzana, defence secretary of the Philippines, where the group’s influence has taken a hold in its troubled Mindanao region.

This is a blow to the organization considering al-Baghdadi’s stature as a leader. But this is just a momentary setback considering the depth and reach of the organization worldwide, Lorenzana said. Somebody will take his place.

Baghdadi had long been sought by the United States – which offered a $25 million reward – as leader of a jihadist group that at one point controlled large areas of Syria and Iraq, where it declared a caliphate.

Islamic State has brutally attacked religious minorities and launched deadly strikes on five continents in a violent campaign that horrified most Muslims.

In their long hunt for Baghdadi, Iraqi intelligence teams secured a break in February 2018 after one of his top aides gave them information on how he escaped capture for so many years, two Iraqi security officials said.

Baghdadi held strategy talks with his commanders in moving minibuses packed with vegetables in order to avoid detection, Ismael al-Ethawi told officials after he was arrested by Turkish authorities and handed to the Iraqis.

Ethawi gave valuable information which helped the Iraqi multi-security agencies team complete the missing pieces of the puzzle of Baghdadi’s movements and places he used to hide, one of the Iraqi security officials said.

Iraqi security officials said Kurdish intelligence agents had exchanged information with counterparts in Baghdad on the movements of Baghdadi and his aides in Syria. One of the Kurds’ sources passed on a golden tip earlier this year.

Suspicious movements were spotted by locals at house in a village in Syria, which was placed under surveillance and turned out to be the house used by Baghdadi, the Iraqi officials said.

The raid on Baghdadi comes weeks after Trump announced the withdrawal of U.S. troops from northeastern Syria, which permitted Turkey to attack America’s Kurdish allies as it sought to set up a safe zone.

Critics expressed concern at the abandoning of the Kurdish fighters who were instrumental in defeating Islamic State in Syria, and said the move might allow the group to regain strength and pose a threat to U.S. interests.

Trump said the raid would not change his decision to withdraw troops from Syria.

But killing Baghdadi could help blunt those concerns, as well as boosting Trump domestically at a time when he is facing an impeachment inquiry in the U.S. House of Representatives.

Regional allies welcomed the operation, with Turkey’s President Tayyip Erdogan saying it marked a turning point in our joint fight against terrorism.

Turkey’s military was in intense coordination with U.S. counterparts on the night of the raid, a presidential spokesman said.

Israeli Prime Minister Benjamin Netanyahu praising an impressive achievement. Saudi Arabia also offered praise.

Egypt, which is fighting militants loyal to Islamic State, said the killing of Baghdadi is an important step towards eradicating terrorism.

U.S. foe Iran, which accuses the United States and its allies of creating Islamic State, was dismissive. Information Minister Mohammad Javad Azari-Jahromi, tweeted: Not a big deal, You just killed your creature.

In the hours before Trump’s announcement, sources in the region had described the raid on a compound in the village of Barisha, in Idlib province bordering Turkey, in the early hours of Sunday.

Trump said eight helicopters carried U.S. special forces to Baghdadi’s compound, where they were met with gunfire before blasting their way in.

The president said he watched the operation in the Situation Room of the White House.

At the height of its power, Islamic State ruled over millions of people from northern Syria to the outskirts of Baghdad.

Thousands of civilians were killed by the group as it mounted what the United Nations called a genocidal campaign against Iraq’s Yazidi minority. It also caused worldwide revulsion by beheading foreign nationals from countries including the United States, Britain and Japan.

The group has claimed responsibility for or inspired attacks in cities including Paris, Nice, Orlando, Manchester, London and Berlin, and in Turkey, Iran, Saudi Arabia and Egypt.