Iranian state media say gunmen have opened fire on one of President Mahmoud Ahmadinejad's campaign offices, wounding three people.
The IRNA news agency says the shooting took place Friday in the southeastern city of Zahedan, near the Pakistani border.
The head of the campaign office, Mohammad Zahed Sheikhi, told IRNA that three men threatened people at the site before they opened fire. He said two campaign workers and a child were injured.
He also said the three suspected gunmen were captured after being chased.
Campaigning has been underway in Iran in preparation for a presidential election on June 12. Mr. Ahmadinejad is seeking a second term and faces three challengers.
Friday's shooting came a day after a suicide attack killed 19 people at a Shi'ite mosque in Zahedan, the capital of Sistan-Baluchistan province.
Meanwhile, an Iranian presidential candidate says he is willing to continue talks with international powers on Iran's nuclear program - a sharp contrast to Mr. Ahmadinejad's position.
Moderate former Prime Minister Mir Hossein Mousavi says if elected he will agree to talks with a group of six world powers that have sought discussions on Iran's nuclear efforts. The group is made up of Germany and the five permanent members of the U.N. Security Council - the United States, Britain, China, France and Russia.
President Ahmadinejad recently rejected talks with the group.
Some information for this report was provided by AFP and AP.