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North Sea Crude-Brent diff firms, Ekofisk falls

VIENNA, March 5 (Reuters) - The North Sea Brent Blend price firmed on Thursday while Ekofisk was offered lower. * OPEC agreed on Thursday to cut oil output by an extra 1.5 million barrels per day (bpd) in the second quarter of 2020 to support prices that have been hit by the coronavirus outbreak, but made its action conditional on Russia and others joining in. PLATTS WINDOW * Brent Blend: BP bid for a cargo at dated Brent plus 55 cents loading March 28 to April 7. * Forties: BP bid at dated Brent plus 50 cents loading March 28 to April 7. * Ekofisk: BP offered at dated Brent plus $2.15 loading April 2-4. * Brent Blend: BP withdrew a bid at dated Brent plus 5 cents loading March 24-26. (Reporting by Julia Payne;Editing by Elaine Hardcastle)