Media playback is unsupported on your device Media caption The BBC's Frank Gardner has been given access to the facility that was damaged in Saudi Arabia on 14 September
The UN has welcomed a proposal from Yemen's Iran-backed Houthi rebels to end all attacks on Saudi Arabia as part of a peace initiative.
A statement said the proposal could send "a powerful message of the will to end the war".
The offer comes a week after drone and missile strikes hit Saudi Arabian oil facilities.
Houthi rebels have claimed to have carried out the attack, but the US and Saudi Arabia have blamed Iran.
Tehran denies any involvement in the strikes.
Yemen's civil war has killed 10,000 and pushed millions to the edge of starvation in what has become the world's worst man-made humanitarian disaster.
Saudi Arabia and its regional allies drastically escalated the conflict in 2015 when they launched an air campaign against the Houthis, who had ousted President Abdrabbuh Mansour Hadi and seized the capital, Sanaa.
The Houthis have launched numerous drone, missile and rocket attacks on the Gulf kingdom.
What have the Houthis offered?
In a televised announcement, Houthi Supreme Political Council chair Mahdi al-Mashat said the group would end all strikes on Saudi Arabia, provided the kingdom and its allies did the same.
"We reserve the right to return and respond in the case there is no reaction to our initiative," he said, and called on all parties in Yemen to work towards "comprehensive national reconciliation".
Image copyright Reuters Image caption The announcement came as Houthi followers marked the fifth anniversary of the rebels' capture of Yemen's capital, Sanaa
On Saturday, UN Special Envoy for Yemen Martin Griffiths welcomed the halt on strikes and the calls for a political solution.
"The special envoy stresses the importance of taking advantage of this opportunity and moving forward with all necessary steps to reduce violence, military escalation and unhelpful rhetoric," a statement issued from his office read.
What about the attacks on Saudi oil facilities?
The Houthis have repeatedly claimed responsibility for the attacks on the Abqaiq oil facility and the Khurais oil field on 14 September which affected markets around the world.
But both the Saudis and the US have laid the blame squarely on Iran.
Saudi Minister of State for Foreign Affairs Adel al-Jubeir on Saturday said the weapons used were Iranian and vowed to release their full findings.
Speaking to reporters in Riyadh, Mr Jubeir said his government was in consultation with allies and would take "necessary measures" after its investigation was complete, without giving details of possible actions.
"The kingdom calls upon the international community to assume its responsibility in condemning those that stand behind this act, and to take a firm and clear position against this reckless behaviour that threatens the global economy," he said.
Media playback is unsupported on your device Media caption Saudi Arabia says the direction of the strikes showed the missiles could not have come from Yemen
The Trump administration backs the Saudi accusations. Unnamed senior officials have told US media that the evidence suggests the strikes originated in the south of Iran.
Officials on Friday announced a moderate deployment of US troops to Saudi Arabia, to help boost its missile and air defences.
But the head of Iran's Revolutionary Guard in Iran, Maj Gen Hossein Salami, warned on Saturday that the country's "readiness to respond to any aggression is definitive".
"Be careful, a limited aggression won't remain limited. We'll pursue any aggressor," he said at the opening of an exhibition of captured drones in the capital, Tehran. "We'll continue until the full destruction of any aggressor."
Speaking at the same event, the head of the Guards' aerospace branch, Brig Gen Amirali Hajizadeh, said the US ought to learn from its past failures and that any attack on Iran would receive "a crushing response".
The country's Revolutionary Guard Corps (IRGC) are an elite branch of Tehran's military and have been designated a terrorist organisation by the US.
Iran, the regional rival of Saudi Arabia, is an opponent of the US, and tensions between the two have risen markedly this year. The US said Iran was behind attacks on two oil tankers in the Gulf in June and July, as well as on another four in May - accusations rejected by Tehran.
Yesterday, President Hassan Rouhani of Iran said if the goal is peace and security, then foreign powers should "get out of the region" as their presence could cause an arms race. He also announced a new security initiative for the Persian Gulf, the Gulf of Oman and the Strait of Hormuz to be unveiled at the United Nations General Assembly later this week.

Rouhani delivering the speech 
Rouhani was speaking at the opening of , an annual commemoration of the eight-year , which features military parades. "The presence of foreign forces can be dangerous for the region, international waters, as well as the security of shipping lines and energy, but our path is to create unity and coordination with regional countries," he said. "Those who want to link the region’s incidents to the Islamic Republic of Iran are lying like their past lies that have been revealed ... If they are truthful and really seek security in the region, they must not send weapons, fighter jets, bombs and dangerous arms to the region."

"Your presence has always been a calamity for this region and the farther you go from our region and our nations, the more security would come for our region", he continued in the speech which was delivered in Tehran, the capital. Rouhani's new security plan would be led by Iran and feature support from regional countries in securing the waterways in the region. According to the Associated Press, Iran has increased cooperation in the last few years with the navies of China, India, Oman, Pakistan, and Russia.

The speech came approximately one week after an attack on oil infrastructure in Saudi Arabia which halved Saudi oil output. The attack was claimed by the  in Yemen, but both Saudi Arabia and the United States have alleged Iranian involvement. The initial reports were of drone attacks, but the Saudi government said the attack included  which could not have originated in Yemen.

The United States was more forceful in blaming Iran for the attack, committing to send more troops to Saudi Arabia. Recently, the United States announced a naval coalition to patrol the Persian Gulf which was joined by Australia, Bahrain, Saudi Arabia, the United Kingdom and the United Arab Emirates.

The annual meeting of the United Nations General Assembly is set to open tomorrow.