Hani Mohammed, Associated Press
Smoke rises after a Saudi-led airstrike hit a site believed to be one of the largest weapons depot on the outskirts of Yemen's capital, Sanaa, on Tuesday, May 19, 2015. The Saudi-led coalition on Tuesday carried out the heaviest airstrikes near the Yemeni capital since a five-day truce with Yemen's Shiite rebels expired earlier this week, hitting weapons depots in the mountains surrounding Sanaa and sending dozens of families fleeing their homes in panic.

SANAA, Yemen — The United Nations has announced peace talks on Yemen's crisis, setting May 28 as the date for the start of negotiations in Geneva.

There was no immediate reaction from the internationally recognized government of Yemeni President Abed-Rabbo Mansour Hadi, now in exile in Saudi Arabia. And it's unclear if the Shiite rebels, known as the Houthis, would attend the talks.

U.N. chief Ban Ki-moon has urged all parties to engage in the talks "without pre-conditions," stressing the only way to resolve Yemen's conflict is an "inclusive, negotiated political settlement."

Meanwhile, Saudi news site Sabq says the rebels, who have been targeted by a Saudi-led airstrikes campaign since March 26, killed one Saudi soldier in a cross-border assault in the area of Jizan Wednesday.

Anna reported from the United Nations.