UNITED NATIONS — Hundreds of thousands of children in Yemen face life-threatening malnutrition, millions lack access to health care or clean water, and some have been drafted as soldiers in the year-old war, the United Nations Children’s Fund said on Tuesday.

A UNICEF report said all sides had “exponentially increased” the use of child soldiers in the conflict between Houthi forces, allied to Iran, and a Saudi-led coalition supporting Yemen’s President Abd-Rabbu Mansour Hadi. It knew of 848 documented cases, including boys as young as 10.

“On average, at least six children have been killed or injured every day,” said the report “Childhood on the Brink.” UNICEF has confirmed 934 children directly killed and 1,356 injured, but says they are “only a tip of the iceberg.”

“Sixty-one percent of those (children) killed and injured were in (Saudi-led) air strikes across the country,” Julien Harneis, UNICEF’s Representative in Yemen, told a briefing by telephone from the capital Sanaa.

All sides have violated international law by using indiscriminate and disproportionate force that means “children die unnecessarily and wrongly”, he said, citing multiple coalition strikes on outdoor markets.

Basic services and infrastructure are “on the verge of total collapse,” the report said, noting attacks on schools, hospitals and the water and sanitation system.

The U.N. said last week the warring parties had agreed to a cessation of hostilities from April 10 and peace talks from April 18, after a year of war that has killed more than 6,200 people.