Bono, Bob Geldof and other celebrities pressed the world's wealthiest countries Wednesday to come through with more pledged financial aid for Africa.

The Irish rock stars-turned-activists presented a new report that found the Group of Eight countries have collectively donated a fraction of the $22 billion in extra funds they pledged in 2005 to be paid by 2010.

"What this big, long, exact, cold and brutal analysis shows us is that halfway to this historic date of 2010 — halfway — these wealthy countries ... have delivered 14 percent. How tragic is that?" Geldof told reporters in Paris.

"What a failure for all of us," he said.

The report by Data, an advocacy group aimed at wiping out extreme poverty and AIDS in Africa, says targeted aid is working, but countries are falling behind in their commitments.