"But first we need to know who and why they acted like that", Mr Le Drian said, adding that the Houthi claims lacked credibility.
Johnson said he would be discussing Iran's actions in the region with President Hassan Rouhani at the United Nations meeting, as well as pushing for the release of several dual-national Iranians who he said were being held "illegally and unfairly".
The extra USA presence is the first step in increasing security, Defense Secretary Mark Esper told reporters; he didn't rule out additional moves down the road.
Saudi state oil firm Aramco has told Japanese refiner JXTG Nippon Oil & Energy about a possible change in shipment, raising concern about the kingdom's ability to supply crude oil a week after attacks on its refineries, the Nikkei Asian Review reported.
As Saudi Arabia prepared to celebrate its National Day with entertainment events, firework displays and cultural events, Iran staged a military parade in Tehran on Sunday with tanks, missiles and armored vehicles.
But Mr Rouhani used his speech to tell foreign powers to "stay away" from the Gulf.
There had been some speculation that Trump and Iranian President Hassan Rouhani would meet at the United Nations in an effort to tamp down tensions between U.S. and Iran after an attack on Saudi oil facilities earlier this month.
France has led a European effort to try and defuse tensions between Washington and Tehran but those efforts have stalled, with Iran reducing its commitments to a 2015 nuclear deal with world powers and the United States refusing to ease sanctions that have strangled Iran's economy.
No hurry to strike trade deal with China
They are devaluing their currency, which means the tariffs are not costing us probably anything, but certainly not very much. Trump's critics were wrong to assume the President was just bluffing when he threatened an all-out trade war, he said.
Trump and (Iranian) President (Hassan) Rouhani is not the number one subject.
He said: "We will present a plan to the world at the United Nations that the Islamic Republic of Iran, in cooperation with the countries of the region, can create security for the Persian Gulf and the Oman sea with the help of the countries of the region". "We will consider in what way we could be useful, if asked, depending on what the exact plan is".
"What we want is that these events and actions are documented and then the global community will be within its right to ask for explanations".
A United Kingdom official told The Associated Press that a claim of responsibility for the attacks by Iran-allied Houthi rebels in Yemen was "implausible".
"The UK is attributing responsibility with a very high degree of probability to Iran for the Aramco attacks".
The British foreign secretary, Dominic Raab, on Sunday described it as "implausible" that the Saudi oilfield attacks were perpetrated by the Houthi movement.
Iran denies being responsible and has warned any retaliatory attack targeting it will result in an "all-out war".
Numerous sanctions had applied before Tehran's 2015 nuclear deal with world powers promised to lift them, in exchange for curbing the country's atomic program.