KARACHI: Escalating Houthi attacks on Saudi Arabia are raising concerns among Pakistani investors and economists, who warned this week that sustained increases in global oil prices could add up to $1. 2 billion to the country’s quarterly import bill. The Iran-backed Houthis have intensified attacks on Saudi civilian and energy infrastructure, including Riyadh’s King Khalid International Airport, where a strike on Saturday killed 13 people and injured more than 300. A subsequent attack targeted an



