At least 10 people have been killed and some 75 others injured in a wave of bombings in Iran ahead of this Friday's presidential election. Reports said two people were killed late Sunday when a blast struck in east Tehran. At least two other bombings were reported in the capital, but there were no reports of casualties from these. Earlier Sunday, eight people were reported killed and more than 70 others injured in four bombings targeting government buildings in Ahvaz, capital of the western Khuzestan province bordering Iraq. Authorities were quoted as blaming the blasts on opposition groups who had come into Iran from Iraq to destabilize the country ahead of Friday's election. Interior Ministry Spokesman Amir-Hossein Motahar linked the blasts to ethnic unrest in April in Khuzestan, which is a partly Arab-speaking province. He said: "The first reports indicate that these bombs were hand made and they were made inside of Iran.” The interior ministry called the blasts a "terrorist act." It was not immediately clear if the Teharan and Ahvaz blasts were linked. An Iranian-Arab separatist group has claimed responsibility for the Ahvaz explosions. President Mohammad Khatami convened an emergency cabinet meeting late Sunday to discuss the blasts and ordered security services to investigate the attacks.