Iran acknowledged for the first time on Monday that an explosion had occurred at a satellite launch site in the country’s north after images of the aftermath of the blast circulated last week.

An Iranian government official said the explosion was caused by a technical error during a test launch.

The information came days after President Trump prompted confusion when he posted a message on Twitter referring to the explosion — accompanied by an image of the site that some suspected was once classified — noting that “the United States of America was not involved in the catastrophic accident.”

Ali Rabiei, a spokesman for the Iranian government, confirmed on Monday that an explosion had taken place at a launchpad at the Imam Khomeini Space Center, in a statement reported by the Iranian state news outlet IRNA.