BONN, West Germany (AP) _ West Germany has banned the son of the late Shah of Iran from addressing a weekend rally of Iranian exiles, a Foreign Ministry spokesman said Friday.

The ban comes at time of increased political and business contacts between West Germany and Iran's revolutionary government.

The shah's son, Reza Pahlavi, was banned from entering West Germany in May 1987 and that the ban was still in force, said spokesman Hanns-Heinrich Schumacher.

Reza Pahlavi, who lives in the United States, planned to address a meeting of 4,000 Iranian exiles in Cologne on Sunday.

Reza Pahlavi's father, Shah Mohammed Reza Pahlavi, died in exile after being overthrown in 1979.

West Germany and Iran have stepped up contacts to promote bilateral business and political ties.