Anti-China riots in Vietnam will hurt the confidence of investors and damage relations, experts said, as thousands of evacuated Chinese workers arrived home on Tuesday.

A total of 3,553 workers arrived at Xiuying Port in Haikou, Hainan province, after traveling for nearly 20 hours. Beijing has sent charter flights and four vessels to evacuate Chinese workers in Vietnam, where violence targeting foreign companies has left at least four Chinese nationals dead and more than 100 others injured since May 13.

China Metallurgical Group Corp said on Tuesday that four of its workers were killed last week in the riots.