Saudi Arabia has moved to impose a partial cease-fire in Yemen, say people familiar with the plans, as Riyadh and the Houthi militants the kingdom is fighting try to bring an end to the four-year war that has become a front line in the broader regional clash with Iran. Saudi Arabia’s decision follows a surprise move by Houthi forces to declare a unilateral cease-fire in Yemen last week, just days after claiming responsibility for the Sept. 14 drone and cruise-missile strike on Saudi Arabia’s oil industry. While the Houthis fired two missiles at Saudi Arabia earlier this week, the strike wasn’t seen by Saudi leaders as a serious attack that would undermine the new cease-fire efforts. Houthi leaders initially said they were responsible for the attack on the oil facilities, but Saudi, U.S. and European officials have dismissed the claims as a transparent attempt to obscure Iran’s role in the strike. Yemeni fighters, these officials say, have neither the weapons nor the skills to carry out such a sophisticated strike.