Five people were killed on Wednesday and 23 others wounded when Yemen’s Houthi rebels fired a ballistic missile at the strategic northern city of Marib, a medical source said. The medic said that “two soldiers and three civilians were killed” in the strike, which the Houthis claimed on Twitter. Marib, in an oil-rich province of the same name, is the government’s last northern stronghold, and the Iran-backed Houthi rebels have been fighting to seize it for months. A pro-government military source also said a ballistic missile shot by the Houthis landed in the city. The attack comes a day after …