FBI arrests 'Chinese agent' at LA airport for spying on Taiwan Prez's son. The FBI arrested California realtor Wanying "Heather" Zhang at Los Angeles International Airport on Sunday for allegedly surveilling Ting-Yu Lai, US-based son of Taiwan President Lai Ching-te. Zhang allegedly recorded Lai, his wife and their son and sent messages to a Chinese government handler via WeChat. She has been charged with acting as an unregistered agent of a foreign government.