(New York Times) Saudi Arabia announced on Wednesday night that it had begun a military campaign in Yemen, the beginning of what a Saudi official said was an offensive to restore a Yemeni government that had collapsed after rebel forces took control of large swaths of the country.

The air campaign began as the internal conflict in Yemen showed signs of degenerating into a proxy war between regional powers. The Saudi announcement came during a rare news conference in Washington by Adel al-Jubeir, the kingdom’s ambassador to the United States.

Mr. Jubeir said that the Saudis were part of a coalition of about 10 nations determined to blunt the advance of Shiite Houthi rebels, who have overrun Yemen’s capital and forced the American-backed government to flee the war-racked country.

Note: Read our discussion guidelines before commenting.