RIYADH: Saudi Arabia's deputy defense minister on Thursday accused Iran of ordering an attack on Saudi oil pumping stations that Yemen's Houthi militia has claimed responsibility for.The attack "proves that these militias are merely a tool that Iran's regime uses to implement its expansionist agenda," tweeted Prince Khalid bin Salman, a son of King Salman. "The terrorist acts, ordered by the regime in Tehran, and carried out by the Houthis, are tightening the noose around the ongoing political efforts." The Houthis, which have been battling a Saudi-led military coalition for four years, said they carried out Tuesday's drone strikes against the East-West pipeline, which caused a fire but Riyadh said did not disrupt output or exports. The head of the Houthis' Supreme Revolutionary Committee denied that Iran directed the strike and said the movement manufactures its drones locally. Tehran also denies providing arms to the Houthis. "We are not agents for anyone," Mohammed Ali al-Houthi told Reuters. "We make decisions independently and do not take orders for drones or anything else." Other Saudi officials fired off similar tweets, ratcheting up pressure on the kingdom's regional archenemy amid heightened tensions between Washington and Tehran over sanctions and US military presence in the Gulf. "The Houthis are an integral part of the Revolutionary Guard forces of Iran and follow their orders, as proven by them targeting installations in the kingdom," Minister of State for Foreign Affairs Adel al-Jubeir tweeted. The ambassador to Yemen followed up, writing that the Houthis had "made Yemen a platform for Iranian terrorism against Yemenis and their interests, and a tool to attack Saudi Arabia."