Two Japanese nationals were killed in China’s northeastern city of Dalian last month, it was revealed on Tuesday.

According to the Japanese Consulate General in Shenyang, local authorities notified the mission on May 25 that a Chinese national has been taken into custody in connection with the killings, which took place on May 23.

The case is under investigation, and local police have told the consulate that the incident arose from a business dispute between acquaintances.