Syrian President Bashar al-Assad today concludes an official visit to Tehran, one day after he and Iran's new president, Mahmoud Ahmadinejad, called for closer cooperation. Iran's official news agency IRNA quoted Ahmadinejad on Sunday as saying at a joint news conference with Assad that "the existence of common threats requires more cooperation between Tehran and Damascus." Assad said "Iran and Syria should pay attention to terrorism, which is spreading in the Middle East." Neither president provided details about their statements. Assad, who arrived in Tehran on Sunday, is the first foreign leader to visit Ahmadinejad, a religious conservative who took the oath of office on Saturday following his election victory in June. Their meeting comes as the United States has accused both Syria and Iran of not doing enough to prevent insurgents from entering Iraq.