At least two people were killed and 16 injured yesterday when two bombs exploded in separate districts of Tehran, Iranian newspapers reported.

Bomb explosions in the Iranian capital in the past year have killed at least 10 persons and wounded more than 100, but no one is known to have been arrested.

The state radio also reported that drug smugglers shot dead seven Revolutionary Guards who were pursuing them in the southeast province of Baluchistan earlier in the week.

Meanwhile, the daily Kayhan newspaper published extracts of a document that, it said, showed close colabortaion between the U.S. Embassy and Ayatollah Kazem Shariatmadari, one of Iran's senior clergymen, less than a week befor the shah left Iran in January 1979.

The newspaper said the document, detailing conversations between Shariatmadari and an unnamed embassy official, was addressed to the State Department in Washington and signed by William Sullivan, the last U.S. Ambassador in Tehran. It was reportedly found after militant students seized the embassy in November 1979.

Shariatmadari formerly led a moderate current of opposition to the shah but was discredited after opposing the sweeping powers given to Ayatollah Ruhollah Khomeini. For the past year he has remained under virtual house arrest in the holy city of Qom. He retains influence as spiritual leader of Iran's 8 million-strong Azerbaijani minority.