Armed fighters attacked the mine in Shiroro region of Niger state on Wednesday afternoon.
Gunmen attacked a local mining site in central Nigeria, killing “many security personnel” and abducting some workers including four Chinese nationals, authorities said on Thursday.
The State Commissioner for Internal Security Emmanuel Umar said security forces had responded to a distress call on Wednesday after gunmen invaded a mining site at Ajata Aboki village in Niger state’s Shiroro area.
“Consequently, the joint security team engaged the terrorists and there were yet to be determined number of casualties from both sides,” Umar said in a statement.
“However, a yet to be ascertained number of workers in the mining site, including four Chinese nationals, were reported to have been abducted.”
Authorities did not disclose the name of the company, the latest affected in attacks targeting foreigners over the years in Nigeria though not as frequent as they used to be.
Three Chinese nationals were abducted in a similar attack in Niger state earlier this year while working at a hydroelectric power plant.
In November, Chinese authorities issued a travel advisory warning their citizens and companies against travel to “high-risk” areas in Nigeria and other parts of Africa.
The state of Nigeria’s security has deteriorated under President Muhammadu Buhari, a retired military general who became president in 2015.
Wednesday’s attack is the latest incident in a cycle of violence that has killed hundreds in the past year. A growing kidnap-for-ransom strategy has also seen more victims held in captivity for months, including dozens kidnapped in a train attack near the capital city in March.
While most of the attacks have happened in the northwest region, they are gradually seeping into central Nigeria. Niger State, the largest of the country’s thirty-six states by landmass, is next to Abuja, the federal capital.
Nigeria’s overstretched security forces have also been fighting Boko Haram in a 13-year conflict where 40,000 people have been killed and another 2.2 million displaced since 2009.