about 1,100 km -LRB- 700 miles -RRB- southeast of Tehran , near Iran 's borders with Pakistan and Afghanistan . Sistan-Balochistan province -- which shares a border with Pakistan -- is the site of frequent clashes involving Iranian police , drug dealers and armed groups . The province is located on a major narcotics-smuggling route between Afghanistan and Pakistan . Azad said information on the arrested terrorist group would be unveiled to the public once interrogations were complete . `` The terrorists and notorious gang planned to stir order and security in the province on the eve of -LRB- the June 12 presidential -RRB- elections , using ongoing insecurity in our eastern neighbors , '' he said Thursday . Several days of mourning were reported to be under way for victims of the explosion . Ayatollah Ahmad Khatami , a hard-line cleric who led Friday prayers in Tehran , said there were signs that the United States and Israel were involved in the mosque bombing , IRNA reported . The cleric , who put the death toll at 25 , condemned the bombing before a congregation on the Tehran University campus . CNN 's Shirzad Bozorghmehr contributed to this report
TEHRAN , Iran -LRB- CNN -RRB- -- Gunmen on motorcycles fired Friday on a campaign office for President Mahmoud Ahmadinejad , wounding two adults and a child , according to a report by Iran 's state-run news agency . President Mahmoud Ahmadinejad was not present at the time of the attack . The shooting happened about 5 p.m . in front of the entrance to the campaign office , campaign representative Mohammed Reza Zahed Shaikhi told IRNA . Ahmadinejad , who is running for a second term in office , was not present . Iran 's presidential election will take place on June 12 . The attack happened in Sistan-Balochistan province in southeastern Iran , the same province where a Shia mosque was bombed Thursday . Several suspects have been arrested in connection with Thursday 's attack in the town of Zahedan , which killed between 15 and 20 people , according to Iranian media reports . No group publicly accepted responsibility for the mosque attack , but the provincial governor , Ali-Mohammad Azad , blamed a terrorist group that he said would be unveiled to the public once the suspects have been interrogated , IRNA reported . Zahedan is