Yemeni civilians were killed and injured in Thursday raids carried out by the Saudi-led coalition on Sana'a, said sources inthe Houthi-held capital.
The Arab coalition has announced the launch of a "qualitative operation against Houthi military targets in Sana'a to neutralize the group's capacities in implementing hostile acts".
The attack came two days after the Iranian-backed rebels claimed responsibility for targeting two Saudi oil facilities with 7 drones.
58 people were killed or wounded by the coalition airstrikes that hit residential quarters at Rabat-Raqas crossroads in Sana'a, the Houthi-run al-Masyrah TV reported.
Six people, including 4 children, were killed and 52 others, including two Russian female medical workers, were injured, the channel quoted Houthi health minister as saying.
According to the coalition account, the raids "accurately hit legitimate military targets, which military intelligence confirmed to include military bases, establishments and weaponry depots of the Iranian-backed Houthiterrorist militias."
The Houthi assaults on Saudi "vital facilities are gross violations of the international human law and amount to war crimes," the coalition added in a statement.
Coalition forces will "pursue all terrorists across Yemen and reach all sites from which terrorist assaults are launched."
On Tuesday, Saudi Arabia claimed that bomb-laden drones attacked two Aramco-owned oil pumping stations in Riyadh region, but supplies have not stopped.
On Wednesday, the United Arab Emirates, another key ally in the West-backed coalition, threatened to "retaliate hard" to any Houthi attacks on UAE targets.
Other sites hit by Thursday airstrikes are the first armored division,maintenance camp, presidential compound, Attan Mont, Noqum Mont, and a building of information ministry, according to local sources in Sana'a.
Yemen has been racked by a 4-year bloody conflictbetween the internationally-recognized Yemeni government's forces, backed by a Saudi-led coalition, and the Iranian-backed Houthi rebels who ousted the government in 2014.
On 26 March 2015, the Arab coalition launched a military campaign against the Houthi troops to reinstate the official government of President Hadi.
Coalition aircraft sporadically strike Sana'a to target alleged Houthi arsenal and drone sites, but some strikes have missed targets and left hundreds of civilians killed, pushing UN groups to blame coalition for war crimes.
The conflict has triggered what the UN calls the world's worst humanitarian crisis, with most of the population in need for a type of humanitarian aid and immediate protection, including 14 million people risking famine and some 1.8 million children suffering malnutrition.