Warplanes from a Saudi-led coalition attacked targets in Sanaa at dawn on Sunday, hours after a three-day truce in Yemen's war expired, residents in the capital said.
The cease-fire, agreed to allow for an increased flow of humanitarian aid, ended without renewal after a day of heavy fighting between the Saudi-led Arab coalition and the Iran-allied Houthi movement.
Each side accused the other of repeatedly violating the truce and U.N. attempts to extend it before it lapsed appeared to have failed.