Iran blamed "agents of America" for a bomb blast near a downtown Tehran movie house Monday night, Tehran radio said yesterday. At least one person died in the blast, the radio said, adding that early reports of nine deaths were incorrect.

The official Pars News Agency said the bomb was "prabably" planted by the antigovernment leftist group, Mujaheddin-e-Khalq. Pars continued to refer to nine dead.

The bombing came shortly before the Islamic government officially proclaimed Prime Minister Mohammad Ali Rajai the victor in the presidential elections last week. Rajai's election must still be ratified by revolutionary leader Ayatollah Ruhollah Khomeini.

Pars also reported that 16 members of Mujahedin-e-Khalq were executed by firing squads in five Iranian cities as part of the government crackdown on its opponents since the ouster of former president Abol Hassan Bani-Sadr.

Meanwhile, Iraq reported intensified fighting with Iran in their 10-month-old war for control of the Shatt-al-Arab waterway. The Iraqi High Command said yesterday its forces killed 637 Iranian troops and shot down five helicopters in a 24-hour period.

In another development, Tehran radio reported a major earthquake near the city of Kernan in southeastern Iran that killed 18 and injured more than 200.