Iranian President Mahmoud Ahmadinejad, delivers his speech at a meeting of top prosecutors from Islamic countries, in Tehran, Iran, 22 Apr 2009

Two leading Iranian reformists have officially signed up as candidates for the presidency, challenging President Mahmoud Ahmadinejad as he tries for a second term.

The moderate challengers, former Prime Minister Mir-Hossein Mousavi and ex-parliamentary speaker Mehdi Karroubi, leveled criticism at the current president Saturday as they registered to run for the June 12 poll.

Both men said they would seek to repair Iran's relations with the outside world, which have been damaged during Mr. Ahmadinejad's four-year rule.

Mr. Mousavi is seen as the president's main challenger.

Mr. Ahmadinejad officially declared his candidacy for a second term Friday.

He joined fellow conservative contender Mohsen Rezaei in registering as candidates for the election.