BP has sent a JPY150bn ($1.9bn) bill to Mitsui for helping to clean up the Gulf of Mexico oil spill.

Mitsui holds a 10% stake in the ruptured oil well through its unit Mitsui Oil Exploration, according to Nikkei Business Daily.

In April 2010 BP’s Deepwater Horizon rig exploded and sank off the coast of Louisiana, spilling millions of gallons of oil into the Gulf of Mexico in the world’s worst offshore oil spill.

BP has been selling assets to pay for the clean-up and compensate victims.

Mitsui is expected to reject the payment request because the cause of the spill is not yet known and the details of the clean-up bill are unclear, according to Nikkei.

In August 2010 Mitsui received a $480m bill from BP to help deal with the spill.