At least six people have been killed in clashes between Indian police and hundreds of tribespeople in the eastern state of Orissa, officials say.
The violence erupted during protests against a planned steel plant at Kalinganagar, 120km (80 miles) north of the state capital, Bhubaneswar.
Police say they opened fire after a mob attacked them with arrows. A policeman died, along with five tribal men.
Tension has grown over the plant, which locals say will cost them land.
Police say about 800 tribesmen armed with bows and arrows converged on the proposed Tata Steel plant site near the town of Jajpur to protest at the erection of a boundary wall.
Stones and other missiles were thrown at police who responded with tear gas, district police chief Vinaytosh Mishra told the BBC.
He said police opened fire after the demonstrators shot arrows at them. One policeman was hacked to death by the tribesmen, he said.
A number of injured on both sides have been taken to hospital.
Private steel companies are setting up huge steel mills in mineral-rich states such as Orissa and Jharkhand as India's demand for steel rises.
Locals complain they are not given adequate compensation for land lost.
Police told Reuters news agency the land at Kalinganagar had been acquired by the government for Tata Steel - compensation had been offered to locals but rejected.