Wright told the BBC that the sort of cyber-attacks that have recently reported are usually attributed to North Korea or Iran.

“And who are we in conflict with right now? Well, it’s Iran. So they become, they go to the top of the listed terms of nations capable, and also having a desire to do something like this,” he said, referring to the ongoing war in the Middle East.

US investigators are also looking into whether the hackers could have posed as Iran-based as a ruse to sow further discord amid the US war with Iran, according to the BBC’s US partner CBS.

Jake Braun, former acting White House Deputy National Cyber Director, told the BBC that the Trump administration is involved in its own information war and therefore it might be unlikely to admit that Iran did infiltrate US water infrastructure, even if it was confirmed.

At a cabinet meeting on 31 July, Trump, a Republican, blamed “grossly incompetent” Minnesota officials, including Governor Tim Walz, a Democrat, for the water hack.

Walz responded: “Trump knows exactly who is responsible for this attack, and knows that other states were hit too.”

Iran has yet to comment on these incidents, but Tehran has repeatedly denied involvement in other cyber-attacks over the years, which include water systems, presidential campaigns, hospitals and a casino company in Las Vegas in 2014.

After a 2016 accusation linked to the targeting of banks and a dam outside New York City, Iran’s foreign ministry spokesman said the US should prove such accusations.

Iran has “never had on its agenda any dangerous measures in cyberspace and does not support such moves”, spokesman Hossein Jaberi Ansari said on state TV at the time.