BP says the cost of its Gulf of Mexico oil spill has risen to $8bn �5.2bn - a rise of more than $2bn in the last month alone.
The company said it had paid out about $399m in claims to those affected by the spill.
Last week, responsibilty for the claims was transfered to the Gulf Coast Claims Facility GCCF, which has so far paid out a total of $38.5m.
Plans to permanently seal the well were also progressing well, BP said.
The final sealing of the well is now expected to be completed in mid-September.