The government of Angola is making moves to push diamond miners out of the country to make the area available for commercial enterprises. According to a report from the Thomson Reuters Foundation, the majority of the affected miners are from the Democratic Republic of Congo, which borders Angola to the northeast.

Angola is the worlds fifth-largest supplier of diamonds, and the government is looking to exploit the county’s natural resource by opening mining operations to large companies.

The current push to send the miners back across the border began at the beginning of the month and is affecting approximately 200,000 Congolese. The large number of small-scale mining operations that are being disrupted could have potential implications for the world diamond supply; however, it’s not diamond production that is drawing international attention, but the use of force by the Angolan security forces.

Several of the affected Congolese have reported that the Angolan forces are using extreme violence to gain compliance and that several dozen of the miners have already been murdered by the security forces and their allies, the Chokwe tribe. Much of the violence is taking place in the town of Lucapa, in Lunda Norte province. According to Reuters, Lunda Norte is considered “diamond-rich.”

“There was a lot of violence in Lucapa,” said 28-year-old diamond miner Victor Tshambapoko, while speaking to Reuters. “The military was shooting at us while Chokwe were killing people with machetes. They jointly killed more than a dozen people.”

Several witnesses reported similarly gruesome scenarios.

“Suddenly on Monday (last week) we saw youths from the Chokwe community with Angolan policemen starting to burn the homes of those perceived to be foreigners,” said one Congolese woman while speaking to Agence France Presse (AFP). “When they came to our house, they attacked my husband with a machete and we were forced to flee taking whatever little we could carry,” she said.

Angolan authorities have denied these claims, and state they are unable to cope with the massive influx of migrants crossing over the border. About 1,000 Congolese are crossing over the border every hour, many of which have already been deported before.