DUBAI  - Qatar's central bank sold 1.2 billion riyals ($330 million) of Treasury bills at a monthly auction, with yields falling and the curve steepening compared to last month, it said on Thursday.

It sold 700 million riyals of three-month bills at 2.38 percent, 300 million riyals of six-month at 2.63 percent and 200 million riyals of nine-month at 2.83 percent.

Last month, it sold 900 million riyals of three-month at 2.49 percent, 400 million riyals of six-month at 2.69 percent and 200 million riyals of nine-month at 2.84 percent.

(Reporting by Andrew Torchia) ((andrew.torchia@thomsonreuters.com; +9715 6681 7277; Reuters Messaging: andrew.torchia.thomsonreuters.com@reuters.net))