Viktor Sogomonyan, the Armenian president's press secretary, said Ahmadinejad, who arrived in Yerevan Monday, had returned to Tehran early due to unforeseen circumstances in Iran.
"This will in no way affect the quality of Armenian-Iranian talks conducted at a high level or the implementation of agreements," the press secretary said.
Sogomonyan said the Iranian leader had discussed with Armenian President Robert Kocharyan prospects for expanding bilateral political and economic cooperation, which was followed by a meeting between official delegations and a briefing.
Ahmadinejad also delivered a lecture at Yerevan State University on human rights.
The Iranian leader planned to speak at the country's National Assembly, visit the Blue Mosque in the country's capital and a controversial memorial commemorating victims of an Armenian genocide by the Ottoman Empire in 1915.
The IRNA news agency said that Ahmadinejad had completed the visit agenda and the Iranian delegation was returning to Tehran.
