Iran's Foreign Ministry on Saturday said allegations by G7 foreign ministers that it was behind a deadly drone attack on a tanker off Oman last week were "baseless."

"We strongly condemn the baseless statement by the foreign ministers of the G7 and the European Union's high representative for foreign affairs in which they have directed baseless accusations at the Islamic Republic of Iran," Iran's Foreign Ministry spokesperson Saeed Khatibzadeh said in a statement.

Tehran is seeking to enhance the security of the strategic Gulf waterway and the Strait of Hormuz, the spokesperson said, adding Iran is also ready to cooperate with regional countries in establishing and ensuring stability.

On July 29, Mercer Street, an oil tanker managed by an Israeli-owned company headquartered in London, was attacked on its way from Tanzania to the United Arab Emirates. Two crew members – a Romanian national and a British national – died in the attack.  

In a statement on Friday, the G7 foreign ministers and the high representative of the European Union condemned the attack and said Iran was behind it. 

"This was a deliberate and targeted attack, and a clear violation of international law. All available evidence clearly points to Iran. There is no justification for this attack," the statement said.

Britain's UN ambassador Barbara Woodward said on Friday that her country briefed the Security Council on the evidence it had about the attack.

"We know that Iran was responsible for this attack. And the evidence, we are confident – based on our assessment of the debris that was recovered from the MV Mercer Street – that the system used in the attack was an Iranian Shahed-136 UAV (unmanned aerial vehicle), and these are manufactured only in Iran."

Zahra Ershadi, the charge d'affaires ad interim of Iran's permanent mission to the United Nations, later on Friday rejected the accusation and blamed Israel for destabilizing the region.

The U.S. Central Command also said on Friday that remnants from one of three explosives-laden drones that targeted the vessel indicated it was produced in Iran.

Iran's military denied the allegations and accused the U.S. of weaving a story to accuse and pressure Iran. 

"The Americans say they have found parts of Iran's drones in the water, and this is their evidence. But what laboratory has determined (the drones) belong to Iran?," military spokesman Brigadier General Abolfazl Shekarchi was quoted by IRNA news agency as saying.

(With input from agencies)