The Greek government and shipping industry on Thursday called for a global mobilisation to free the crews of two oil tankers held by Iran in an ongoing dispute with Athens. “We call on all nations to act in order to end this unacceptable incident, and to ensure it does not happen again,” Merchant Marine Minister Ioannis Plakiotakis told reporters. Iran’s Revolutionary Guards on Friday seized the two Greek-flagged tankers in the Gulf, days after Athens said it would deliver to Washington Iranian oil it had seized from a Russian tanker in April. Plakiotakis said last week’s incident posed a “thr…