SINGAPORE - * Iraq's Oil Marketing Company (SOMO) has sold 2 million barrels of September-loading Basra Light to Unipec at a premium of $1.26 a barrel to its official selling price (OSP), several traders told Reuters on Thursday

* SOMO has also sold 2 million barrels of September-loading Basra Heavy to Petro Diamond at a premium of above $1.60 a barrel to its OSP, the traders said

* Prior to this, SOMO sold 2 million barrels of August-loading Basra Light crude to Shell at a premium just above $1 a barrel to its OSP, and 1 million barrels of August-loading Basra Heavy crude to Petro Diamond at a premium close to $2 a barrel to its OSP

(Reporting By Florence Tan and Shu Zhang; editing by Christian Schmollinger) ((shu.zhang@thomsonreuters.com; +65-6870-3549; Reuters Messaging: shu.zhang.thomsonreuters.com@reuters.net; Twitter @shuzhang4))