Iran has "seriously warned" India that it could halt crude supplies if New Delhi failed to pay overdue payments hampered by international sanctions against Tehran, the oil ministry said on Sunday. "We have seriously warned the Indian side of the possibility to halt oil exports if a solution is not found to clear its arrears," Fars news agency quoted National Iranian Oil Company managing director Ahmad Ghalebani as saying. Iran's state-run company, however, said it was working to maintain its trade with India, which as its second largest client after China absorbs about 20 percent of its crude exports. These warnings "do not mean supplies have been halted and we have no plans to stop exports to the Indian market," said NIOC director of international affairs Mohsen Ghamsari.