Yemen’s Houthi rebels said Saturday the US military launched a series of airstrikes on the capital, Sanaa, and the Houthi-held coastal city of Hodeida, less than two days after a US strike wrecked a Red Sea port and killed more than 70 people. The Houthis’ media office said 13 US airstrikes hit an airport and a port in Hodeida, on the Red Sea. The office also reported US strikes in the capital, Sanaa. There were no immediate reports of casualties. The US military’s Central Command, which oversees American military operations in the Middle East, didn’t immediately respond to a request for comment. Story continues below this ad Thursday’s strike hit the port of Ras Isa, also in Hodeida province, killing 74 people and wounding 171 others, according to the Houthi-run health ministry. It was the deadliest strike in the US ongoing bombing campaign on the Iranian-backed rebels. United Nations Secretary-General António Guterres on Saturday said he was “gravely concerned” about the attack on Ras Isa, as well as the Houthis missile and drone attacks on …