Work stopped in January 1979, and Kraftwerk Union fully withdrew from the project in July 1979, with one reactor 50% complete, and the other reactor 85% complete. They said they based their action on Iran's non-payment of $450 million in overdue payments. The company had received $2.5 billion of the total contract. Their cancellation came following the 1979 Iranian Revolution. Iran subsequently requested that Siemens finish construction, but Siemens declined. Shortly afterwards Iraq invaded Iran and the nuclear programme was stopped until the end of the war. The reactors were damaged by multiple Iraqi air strikes between March 1984 and 1988.