The incident took place overnight in Mellat, a popular location near the headquarters of the city media company.
There were no immediate reports of injuries or deaths, but videos on social media showed smoke billowing.
And an Iranian official: We are investigating its dimensions and causes
the deputy governor of Tehran, Hamid Reza Gouda Radi, said that the authorities are investigating the dimensions and causes of the capital's explosion, adding to the semi-official Tasnim news agency, "There was only one explosion inside Malat Park."
In response to a question about whether this was an attack, Judeh Radi said, "We are investigating the dimensions and causes of the accident, and we will provide the information after we are sure.
Far news agency quoted a fire department spokesman as saying that firefighting and rescue teams had been sent to the area in the north of the Iranian capital.
On Wednesday, an Iranian official reported that at least 7 people were killed in an explosion at an oil and gas pipeline station in the southwestern city of Shush.
The mayor of the city of Shush, Adnan Ghazi, said that the explosion also wounded 4 others, who were taken to the city hospital.
It is noteworthy that Iranian oil and gas facilities have witnessed several explosions and fires in recent years.
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