France said on Wednesday that drone attacks on Saudi Arabian oil installations claimed by Houthi rebels were an unacceptable act that threatened regional security. "France strongly condemns the attacks carried out by drones against Saudi oil installations, claimed by the Houthis. These attacks, which undermine Saudi Arabia's security and the stability of the region, are an unacceptable act," foreign ministry spokeswoman Agnes von der Muhll said in a statement. British Foreign Secretary Jeremy Hunt said the attacks undermine conflict resolution efforts. Asian shippers and refiners have put ships heading to the Middle East on alert and are expecting a possible rise in marine insurance premiums after recent attacks on Saudi oil tankers and pipeline facilities, industry sources said on Tuesday. On Monday, armed drones attacked two of Saudi Aramco's oil pumping stations and forced the state producer to briefly shut its East-West pipeline, known as Petroline. The attack came two days after the sabotage of four oil tankers — two of them owned by Saudi Arabia — near the United Arab Emirates. — Agencies div class=" simple-translate-button" style="background-image:url("moz-extension://1eb291e5-1d94-5949-827b-2f1c78b90df1/icons/512.png"); height:22px; left:10px; top:10px; width:22px"