Iranian police said a reported explosion early Saturday at a public park near state TV headquarters in the capital Tehran caused no casualties or damage, the official IRNA news agency reported.
Tehran deputy police chief Gen. Hamid Hodavand said the case was under investigation and details would be provided later. He accused foreign media outlets of exaggerating the reported blast.
A loud blast heard in north Tehran early on Saturday was caused by an "unknown object" exploding in a park but no one was hurt, Iranian state television reported.
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"An unknown object exploded ...There was no damage and no one was hurt," a reporter said.
At 12:52 A.M. Iranian media reported an explosion in northern Tehran followed by dozens of posts from individuals on social media.
Tehran Deputy Governor Hamid Reza Goudarzi, who is in charge of security issues, visited the site. He said rescue teams, firefighters and police found no sign of an explosion, fire or damage in the area.
"Just one explosion took place inside Mellat (People) Park," he had told the semi-official Tasnim news agency earlier in the evening.
Asked whether the incident was an attack, Goudarzi said: "We are investigating the dimensions and causes of the incident and we will provide information after we are sure."
Occasionally, Iranian media have reported on flash-bang grenades exploding without giving details. Those grenades are designed to emit a loud sound and a flash of light without causing serious damage.
Attacks are rare in Iran, but a number of sensitive military and nuclear sites have been targeted in recent years.
Iran has accused Israel of several attacks on facilities and scientists linked to its nuclear program. Israel has neither denied nor confirmed the allegations.