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U.S. President Donald Trump speaks to the media from the South Lawn of the White House in Washington, DC, on June 22, 2019.SAUL LOEB/AFP/Getty Images

U.S. President Donald Trump on Friday posted on Twitter a photo of what appeared to be the site of a failed Iranian satellite launch, raising questions about whether he had disclosed U.S. surveillance secrets.

The black-and-white photo showed the fire-blasted launch site at a space centre in northern Iran including a damaged gantry service tower and a downed mobile erector launcher.

Trump, in his tweet, cited the specific location of the site, saying the United States was not involved in the “catastrophic accident during final launch preparations for the Safir SLV Launch at Semnan Launch Site One in Iran.”

The rocket exploded on its launch pad on Thursday, an Iranian official said. A U.S. official also said Iran suffered a satellite launch failure.

“I wish Iran best wishes and good luck in determining what happened at Site One,” Trump said.

The White House did not immediately provide an answer to a question about the photo.

Patrick Eddington, a former CIA satellite imagery analyst, said the photograph tweeted by Trump appeared to be a classified image taken by a U.S. spy satellite.

“If the president simply tweeted out an image from classified briefing that utilizes our most advanced overhead collection capabilities, it is no doubt welcome news to our adversaries,” said Eddington, now a research fellow at the CATO Institute.

“While he has the authority to declassify any federal document, Twitter is not a legitimate or responsible way to do so.”

A U.S. defence official told CNBC that the picture, which appeared to be a snapshot of a physical copy of the satellite image, was included in an intelligence briefing on Friday.

The Pentagon did not have any immediate comment.

The United States has warned Iran against rocket launches, fearful the technology used to put satellites into orbit could enable Tehran to develop the ballistic missile capability needed to launch nuclear warheads.

Tehran denies the U.S. accusation that such activity is a cover for ballistic missile development.

The Trump administration has ratcheted up economic pressure on Iran this year with economic sanctions to try to force it to renegotiate a pact reached with world powers in 2015 limiting its nuclear program. Trump withdrew the United States from the pact in May last year.

Trump has offered to hold talks with Iran but Tehran says first it must get relief from U.S. sanctions.

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