CAIRO, June 12 (Reuters) - Average yields on Egypt's three-year and seven-year treasury bonds fell at an auction on Monday, data from the central bank showed.

The average yields on the three-year bonds dipped to 18.271 percent from 18.540 percent at the last auction on May 29, while the seven-year bond yields dipped to 18.377 percent from 18.544 percent at the same auction.

(Reporting by Arwa Gaballa; Editing by Andrew Heavens) ((arwa.gaballa@thomsonreuters.com; +20 2 2578 3290;))