The death of Hsu Tsu-tsai, a 42-year-old Chinese engineer, in July 1966 in The Hague, Netherlands caused a diplomatic incident between the Netherlands and China. The mysterious circumstances surrounding Hsu's injuries and death, apparently resulting from his attempted defection, resulted in a twenty-four-week siege of the Chinese legation as Dutch authorities sought to question his colleagues and consular officials, and the suspension of diplomatic relations between the Netherlands and China.