Former national security officials reacted with shock and horror to revelations in The Atlantic that top members of President Donald Trump’s Cabinet sent detailed operational plans and other likely highly classified information about US military strikes on Yemen to a group thread on a messaging app to which a reporter had accidentally been added.

U.S. airstrikes targeting Yemen’s Houthi rebels have pounded sites across the country. The rebels say the one attack Sunday in the capital killed at least one person and wounded more than a dozen others.