HANOI (Reuters) -Police in Vietnam have arrested six people accused of violating mining regulations, including the chairman of a company at the forefront of a drive to create a rare earth industry that could challenge China's dominance of the sector. Vietnam's government is planning to auction new mining concessions for rare earths later this year, and officials from at least one company, Vietnam Rare Earth JSC (VTRE), that had been due to bid were among those arrested. VTRE's chairman, Luu Anh Tuan, was accused of forging value added tax receipts in trading rare earths with Thai Duong Group, which operates a mine in the northern Vietnamese province of Yen Bai, the Ministry of Public Security said on Friday.