Yemen's Houthi rebels on Monday threatened more attacks on Saudi Aramco's oil processing plants, warning that the state-own energy firm's operations could be targeted at "any moment". Speaking on Twitter, Houthi military spokesman Yahya Sarea also warned foreigners to evacuate the area. Global energy prices spiked on Monday after a Houthi-claimed attack on key oil facilities in Saudi Arabia caused the worst disruption to world supplies on record, an assault ...