Blog:Air strike
It is the second recent ceasefire that appears to have quickly collapsed
The government had proposed that it begin late on Friday and run during Eid, the three-day holiday that starts on Sunday and marks the end of Ramadan.
The government’s five conditions included removing road blocks, the withdrawal of rebel forces, the release of detained military personnel, and abiding by the constitution and Yemeni law in general.
But the rebels have asked that the ceasefire be unconditional.
The BBC’s Paul Wood reports from Yemen that people at a camp for the displaced said rebels had been steadily winning territory from the army.
International concern about the conflict has intensified after witnesses said that more than 80 people were killed in a government air raid on a camp for displaced people on Wednesday.
The rebels, known as Houthis, complain of discrimination. They say they want greater autonomy and a greater role for their version of Shia Islam.
Both sides see unwelcome influences from abroad, with government accusing rebels of having Iranian backing and being accused itself of being influenced by Sunni-dominated Saudi Arabia.