Kenyan authorities have arrested 77 Chinese nationals and charged them in a Nairobi court in connection with a cyber command center authorities believe they were planning to use to hack into the country’s communications systems.

Systems found in the center, located on a Nairobi estate, could be used to access banking accounts, ATMs and other systems in Kenya. 

Police discovered the operation — and the Chinese hackers — after they responded to reports of a fire in a rented house on the estate located near the U.S. embassy and U.N. headquarters in Nairobi. 

One Chinese national was killed in the fire, others were “huddled” in a room that contained “sophisticated” equipment, according to a report in The Daily Nation, which said arrests came after a series of raids by law enforcement who suspect the group is responsible for a number of cybercrimes in Kenya.