The detonator also appeared to have a small circuit board inside it, the Times said, which may have linked it to the backup detonation system.
Trump had called the leaks "deeply troubling".
The United States' top diplomat Rex Tillerson also visited London on Friday in an expression of solidarity after Britain reacted furiously to leaks of sensitive details about the investigation emanating from Washington.
Prime Minister Theresa May is expected to raise the issue with U.S. President Donald Trump on Thursday, when she meets him at a North Atlantic Treaty Organisation summit in Brussels. May raised the matter with Trump as they gathered for a group photograph at the North Atlantic Treaty Organisation summit.
Security officials reacted with fury to the leaks, with one telling the Financial Times that lives were now being put at risk.
British police have now resumed intelligence-sharing with their USA counterparts after a brief suspension over a series of leaks by American officials to journalists providing details of the Manchester bomb investigation.
England vs South Africa, 3rd ODI
Stokes's left knee, which was operated on previous year , however, is preventing him from doing much bowling at the moment. He was well supported by David Willey (26) and debutant quick Toby Roland-Jones (37*).
But it wasn't clear USA officials were the source of the images, which the Times defended as "neither graphic nor disrespectful of victims" and consistent with basic reporting "on weapons used in horrific crimes".
A spokesman for Britain's anti-terror police said in a statement that British investigators relied on trust with security partners around the world. Greater Manchester Police say they are working with national police and intelligence agencies in what is being treated as a terrorist incident.
"She expressed the view that the intelligence sharing relationship we have with the USA is hugely important and valuable, but that the information that we share should be kept secure", May's spokesman said.
Unnamed police sources told the BBC the leaks had "undermined their investigation and victims' and witnesses' confidence". "This damage is even greater when it involves unauthorised disclosure of potential evidence in the middle of a major counter-terror investigation".
Trump, who led North Atlantic Treaty Organisation allies in paying respects to the victims, slammed the alleged leaks as "deeply troubling" warning that those responsible could face prosecution. It's not acceptable to me.
He added: "It worries me greatly".
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