Tehran, July 8 (DPA) Iranian President Mahmoud Ahmadinejad Tuesday vowed to enter a 'new era' and offered his country's cooperation in tackling global challenges.

'We are entering a new era in both internal and external policies,' Ahmadinejad said in a speech on state television, his first since the official approval of his re-election.

Ahmadinejad's re-election caused widespread controversies after the opposition accused the government of fraud in the June 12 presidential poll, but the president himself called it 'the freest in the world'.

'For tackling global challenges, the only way is global cooperation,' Ahmadinejad said while offering Iran's cooperation in this regard.

He added that in accordance with the new era and in order to realize his new policies, he would also make some changes in his cabinet formation for the second four-year presidential tenure.