Da Nang

The first remediation agreement between the two countries only occurred in 2006, after persistent advocacy by veterans, scientists and nongovernmental organizations led Congress to appropriate US$3 million for the remediation of the Da Nang airport.

Large amounts of Agent Orange had been stored at the Da Nang airport during the war and contaminated the soil with dioxin.

A close friend, meanwhile, said he knew both Thi Nguyen Phuong and Thi Nguyen Phuong Lan, having introduced them to treatments at a friend's spa in Da Nang, where he lived.

She had left Thailand last week for the Vietnamese coastal city of Da Nang and is not involved in the incident, police said.

The company has since reviewed Hanoi, Ho Chi Minh City and Da Nang as potential locations for investments, with Keith Strier, its vice president of worldwide AI initiatives, touring the cities last month.