Tehran: A senior Iranian Oil Ministry official said yesterday Iran's oil exports to long-time trading partner India had continued despite a dispute over the method of payment, student news agency ISNA reported.

"There has been no disruption in the sale and exports of oil to India in recent days," said Ahmad Qalebani, the head of state National Iranian Oil Company (NIOC).

India buys about 400,000 barrels per day of Iranian crude.

Qalebani said the two countries were determined to carry on cooperating despite problems agreeing a new payment method, after India said last week it would no longer use a regional clearinghouse system which had been criticised for being opaque.

"The economic cooperation between Iran and India in this [oil trade] connection is still continuing," Qalebani said.

Iran, the world's third-largest oil producer, is under sanctions over its nuclear work.

Washington and its allies fear the programme is a cover to build bombs, while Tehran says it is only aimed at generating power.