The UN chief was appalled at reports that children were used to participate in the attacks, said Guterres' spokesman Stephane Dujarric in a statement.
The United States has supported the Saudi-led air campaign against Iran-backed Houthi rebels in Yemen with mid-air refueling support, intelligence and targeting assistance.
The United States has recorded more than 12,662,000 cases with more than 260,800 related deaths as of Wednesday afternoon, according to the real-time count kept by Johns Hopkins University.
The US operation, called Broad USA and headed by Sunny Wang, is based in Hackensack, New Jersey.
The United States and the EU agreed in July to avoid additional tariffs while both sides work to reduce tariffs and lower non-tariff barriers for industrial goods traded in between, but Brussels hinted that the truce may not last long.
The United States has 75,000 test kits for coronavirus and will expand that number "radically" in coming weeks, US Health and Human Services Secretary Alex Azar told ABC's "This Week" on Sunday.
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The UN organization has mobilized international cooperation and assistance to strengthen the transmission of the cultural practices in agreement with the concerned communities, including the Kalash.
The USMCA was signed in November 2018 to replace the existing North American Free Trade Agreement. It was approved by US House of Representatives on Dec 19, but is yet to be ratified by the Senate.
The United States pressed all nations Saturday to "stand with the forces of freedom" in Venezuela, encouraged by a tougher European line as Russia and Cuba stood behind President Nicolas Maduro.
The UN headquarter in New York City. [Photo/Agencies]