 NEW YORK GREENWICH, Conn.--BUSINESS WIRE--International Seaways, Inc. NYSE: INSW INSW and Diamond S Shipping Inc. NYSE: DSSI Diamond S announced today that the required waiting period has expired under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 HSR Act in connection with the proposed stock-for-stock merger transaction between INSW and Diamond S the Merger. The expiration of the waiting period under the HSR Act satisfies one of the conditions to the closing 