The airstrikes targeted the capital Sanaa, the southern city of Aden and the provinces of Lahj and Jouf early today morning, officials and witnesses said. In the northern city of Saada, the stronghold of the Shiite rebels, at least 10 civilians were killed, witnesses said.
It was not immediately possible to verify the eyewitnesses account. The officials spoke on condition of anonymity because they were not authorized to speak to the press.
The rebels have controlled the capital since September.
A Saudi-led coalition, backed by the US, began carrying out airstrikes against the Houthis and their allies in late March, but the campaign has made little progress in pushing back the rebel forces.
More From This Section
Today, a UN official Stephen O'Brien said in Geneva that there is a "looming humanitarian catastrophe" facing Yemen with at least 11.7 million people affected by the conflict and in need of USD 1.6 billion dollars in emergency aid.
More than 1,000 civilians have been killed by the fighting and airstrikes, while one million have fled their homes.