The debate over the safety of artificial intelligence grew personal as key tech leaders said calls for government regulation were self-serving and misplaced.

A string of new, terrifying warnings from the artificial intelligence community has put Congress, the White House and the A.I. industry on notice: Slow the progress of the rapidly developing technology before a swarm of bots takes over the Internet and “kill all humans.”

The conflict in Yemen is intensifying, as government forces launch attacks against Iran-backed Houthi rebels along the Red Sea and Houthis fire into neighboring Saudi Arabia, which supports Yemen’s government.