TAIPEI, Nov 11 — The woman accused of spying for China during an affair with Nvidia chief Jensen Huang used a Hong Kong passport to enter Taiwan, the island’s immigration agency said today, as authorities investigate the incident.

Jensen Huang has admitted to having an affair, reportedly with Alice Huang, a Chinese former executive at Singapore-based Megaspeed who US officials believe was working for Chinese intelligence. Beijing has rejected the spying allegations.

Nvidia’s board announced Sunday that it had opened a probe into Jensen Huang, the company’s chief executive and co-founder, who is no relation to Alice Huang.

“Our government’s relevant agencies are fully informed of the relevant records and information,” National Immigration Agency Director-General Lin Horng-en told reporters, confirming that Alice Huang used a Hong Kong passport to enter Taiwan.