UNITED NATIONS (Reuters) - The United Nations blacklisted a Saudi Arabia-led military coalition on Thursday for killing and injuring 683 children in Yemen and attacking dozens of schools and hospitals in 2016, even as it said the coalition had taken action to improve child protection.

The blacklist attached to the U.N. annual report on children in armed conflict also named the Iran-allied Houthi rebel group, Yemen government forces, pro-government militia and Al Qaeda in the Arabian Peninsula for violations against children in 2016.

The U.N. report said the Houthis and affiliated forces killed and injured 414 children in 2016.

The report from U.N. Secretary-General Antonio Guterres was submitted to the Security Council on Thursday and seen by Reuters. A draft of the blacklist was reported by Reuters on Tuesday.

The actions of the Saudi-led coalition “objectively led” to it being blacklisted for killing and injuring 683 children and for 38 attacks on schools and hospitals last year, the report said, adding that all incidents were verified by the U.N.

The coalition had been briefly added to the blacklist in 2016 and then removed by then-U.N. chief Ban Ki-moon pending review. At the time, Ban accused Saudi Arabia of exerting “unacceptable” undue pressure after sources told Reuters that Riyadh threatened to cut some U.N. funding. Saudi Arabia denied threatening Ban.

In an effort to dampen controversy surrounding the report, the blacklist this year is split into two categories. One lists parties that have put in place measures to protect children, which includes the Saudi-led military coalition, and the other includes parties that have not.

The report, which was produced by U.N. Children and Armed Conflict envoy Virginia Gamba and issued in Guterres’ name, does not subject those listed to U.N. action but rather shames parties to conflicts in the hope of pushing them to implement measures to protect children.

‘EMPTY PROMISES’

Guterres spoke with Saudi King Salman by phone on Wednesday. U.N. spokesman Stephane Dujarric said: “They had a very positive discussion on issues of mutual interest, including the situation in the Middle East and beyond.”

Saudi U.N. Ambassador Abdallah Al-Mouallimi plans to hold a news conference on Friday.

Yemen has been devastated by more than two years of civil war in which President Abd-Rabu Mansour Hadi’s government, backed by the Saudi-led coalition, is fighting to drive the Houthis out of cities they seized in 2014 and 2015.

More than 10,000 people have been killed and the conflict has ruined the economy and pushed millions to the brink of famine. The Houthis control much of northern Yemen, including the capital, Sanaa.

U.N. sanctions monitors reported to the Security Council in January that the Saudi-led coalition had carried out attacks in Yemen that “may amount to war crimes.” Riyadh denies the allegation.

The U.N. sanctions monitors said at the time that the coalition was made up of Saudi Arabia, Bahrain, Kuwait, Qatar, the United Arab Emirates, Egypt, Jordan, Morocco and Sudan.

The coalition has received limited U.S. support, including in logistics. Saudi Arabia and the United Arab Emirates are major recipients of U.S. arms. Saudi Arabia is also a major customer of British defense companies.

“The coalition needs to stop making empty promises to exercise caution, take concrete action to stop these deadly unlawful attacks in Yemen, and allow desperately needed fuel and aid to reach those in need,” said Jo Becker, children’s rights advocacy director at Human Rights Watch.

“Until this happens, governments should suspend all Saudi weapons sales,” she said.

The annual children and armed conflict report is produced at the request of the U.N. Security Council. In 2015 the United Nations left Israel and the Palestinian militant group Hamas off the blacklist, after they had been included in an earlier draft, but criticized Israel over its 2014 military operations.