China is intensifying a crackdown on alleged spies for the U.S., saying it found another case of an individual informing the CIA, adding to a series of espionage accusations between the two nations.

The Chinese Ministry of State Security (MSS) said Monday it is investigating a 39-year-old ministry official identified by his surname Hao for providing information to the CIA in exchange for money. This follows another case earlier this month involving an employee of a military industrial group.

The latest claims come weeks after CIA Director William Burns said his agency has made progress in rebuilding its network in China following setbacks in the country. Tensions between China and the U.S. have risen after a series of incidents in recent months, including an alleged spy balloon and military encounters in the South China Sea.