Phan Phan-Gillis ( savesandy.org ) Chinese authorities have formally arrested an American woman detained six months ago on charges of spying. Phan Phan-Gillis’s husband said Tuesday she was arrested Sunday—just ahead of Chinese President Xi Jinping visit to the U.S. China’s Foreign Ministry said Phan-Gillis, 55, is suspected of “engaging in activities that endanger China’s national security.” The businesswoman was part of a delegation from Houston that was visiting China when she was detained in March on suspicion of spying and stealing state secrets.