The strike hit the Military Engineering Base in Sawan quarter east of the capital, about 500 meters east of the U.S. embassy.
The truce went on effect on Saturday noon local time (0900 GMT) between Saudi-led coalition and Yemeni dominant Shiite Houthi group controlling most part of north Yemen, including the capital Sanaa.
Similar previous truce had collapsed after both sides exchanged fire and traded accusations of breaching the truce.
The war began in March 2015, when Saudi Arabia intervened in military air campaign to restore to power internationally recognized president Abd-Rabbu Mansour Hadi after he was ousted and forced to flee into exile in Saudi capital, Riyadh.
Houthis, backed by forces loyal to former president Ali Abdullah Saleh, overthrew Hadi and his government over alleged corruption accusations.
The airstrikes and ground battles have since killed over 10,000 Yemenis, mostly children and women. Enditem