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A detailed update on the well result and the forward programme will be provided once well operations have been completed. 

ROC OIL WEEKLY DRILLING REPORT

Offshore Mauritania

Roc Oil (Mauritania) Company, a wholly owned subsidiary of ROC, advises that as at 0100 hours (local time) on 28 April 2008, the Banda NW ST-1 sidetrack well, had reached a Total Depth of 2,934 mBRT and wireline logs, including sampling and pressure measurement tools, were being run.

Preliminary logging results indicate that the well has encountered oil and gas columns with contacts similar to those seen in the discovery well, approximately 2 kilometres to the east.

Participating Interests in the PSC Area B Joint Venture are:

 ROC Group Companies  3.693%
 PC Mauritania I Pty Ltd (Operator)  53.846%
 Tullow Oil plc  21.600%
 Mauritania Holdings B.V  11.630%
 Premier Oil Mauritania B Limited  9.231%

Contacts

Tullow Investor Relations Camarco (Media)

ir@tullowoil.com
Matthew Evans

(+44 20 3757 4980)
Billy Clegg
Georgia Edmonds
Rebecca Waterworth

Notes to editors

Tullow is an independent energy company that is building a better future through responsible oil and gas development in Africa. Tullow's operations are focused on its core producing assets in Ghana. Tullow is committed to becoming Net Zero on its Scope 1 and 2 emissions by 2030, with a Shared Prosperity strategy that delivers lasting socio-economic benefits for its host nations. The Group is quoted on the London and Ghanaian stock exchanges (symbol: TLW). For further information, please refer to: www.tullowoil.com.

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