By
"An individual wearing a shroud tried to push through the doors of the president's office and was warned by security guards," Tehran's deputy governor for security Mohsen Nasj-Hamedani told the Fars and Tasnim news agencies.
"The person was prevented from going further and was wounded by police gunshots," Nasj-Hamedani said, adding that authorities were trying to determine the individual's identity and motive.
Tasnim reported it had received phone calls from witnesses saying the man was carrying a machete.
Some ultra-conservative activists in Iran wear shrouds during protests against the West or to denounce perceived insults to Islam, as a symbol of their determination to defend a cause to the death.