TEHRAN (AFP/Reuters) - Iran warned the opposition on Tuesday that it will tolerate no further protests after the official poll watchdog upheld the re-election of President Mahmoud Ahmadinejad over complaints of fraud. A defiant Ahmadinejad hit out at world powers over their response to unrest which has shaken the foundations of the Islamic regime, as Western governments condemned the continued detention of four British Embassy staff in Tehran. Iranian clerics lashed out at opposition leader Mir Hossein Mousavi with some branding him anti-revolutionary. Mousavis camp remained defiant, reiterating a demand for the cancellation of the June 12 vote which unleashed the worst crisis in Iran since the 1979 Islamic revolution. But opposition to Ahmadinejads victory appeared to be waning as the massive street protests seen in the immediate aftermath of the election become sporadic gatherings easily dispersed by riot police and the Basij militia. The head of the seminary in Qom - Irans clerical nerve centre - called for a sustained crackdown on protests, saying demonstrators were treading the path of the worlds arrogance, a term Iranian leaders use to describe the United States. The regime must confront them, said Ayatollah Morteza Moghtadai. Ahmadinejad himself pledged to break the stranglehold of the major powers in his first public comments since his controversial re-election was upheld by authorities. We must use all the capacities to break the monopoly of the global powers, the official IRNA news agency quoted Ahmadinejad as saying. The President hailed his disputed re-election as a victory for the Iranian people and a defeat for the Islamic Republics enemies. And the official electoral watchdog, the Guardians Council, warned defeated candidates that its decision on Monday evening to uphold official results giving the incumbent a landslide first-round victory were no longer subject to challenge. They cannot object or protest in any other way, Council spokesman Abbasali Kadkhodai told reporters. The United States warned that the partial review would not satisfy critics of the election while Italy warned of possible further sanctions against Iran. The deputy head of the electoral watchdog, Ayatollah Mohammad Yazdi, told the Fars news agency: If people like me remain in the Guardians Council and if Mousavi is a candidate in the next election, we will not approve him. Another cleric Ayatollah Ahmad Khatami even referred to Mousavi - who was premier in the 1980s and once a close aide to the late revolutionary leader Ayatollah Ruhollah Khomeini - as being anti-revolutionary and against the regime. Italian Prime Minister Silvio Berlusconi warned of more penalties against Iran, which is already under three sets of UN sanctions over its refusal to halt sensitive nuclear work.