Sept 8 (Reuters) - Operations at some energy facilities in Saudi Arabia, the world's top oil exporter, were halted on Tuesday following attacks by Yemen's Iran-alignedHouthis that wounded 73 people, in what Saudi authorities described as a dangerous escalation.Fires erupted at the sitesand several people were injured as firefighting and other emergency teams rushed to contain the blazes and assess the damage, the Saudi energy ministry said.

Fires erupt at several sites; senior Saudi air force officer vows coalition will respond firmly to attacks; Houthis say they will soon make statement about large-scale op

Yemen's Houthis claimed on Tuesday a wave of attacks on oil facilities and utilities in Saudi Arabia’s south.