HERAT (AFP) - Two Iranian nationals missing in western Afghanistan for several days are believed to have been kidnapped, Afghan officials said Saturday. The two, working for an Iranian construction company, went missing on Thursday while they were travelling from the western city of Herat to Islam Qala on the border with Iran, the officials said. "They have been abducted," Herat city police spokesman Noor Khan Nikzad told AFP. However there had been no word from any abductors, including demands for ransom, and it was unclear who had taken the men, he said. Police would meet tribal elders from the area to try to identify who might have snatched them, Nikzad said. But the foreign ministry cast doubt on the abduction theory.