Staff of the U.S. consulate in Chengdu made final efforts to clear the premises on Sunday as security remained tight outside, ahead of a Monday closure ordered by Beijing as China-U.S. relations continue to worsen.

A mini tourist atmosphere prevailed outside the facility on a tree-lined street on a hot Sunday, as onlookers shared sidewalk space with dozens of uniformed and plainclothes police opposite the entrance.

Consulate closures in Houston and Chengdu have escalated a sharp deterioration in ties between the world's two biggest economies, which were already their worst in decades amid disputes over trade and technology, the COVID-19 pandemic, China's territorial claims in the South China Sea and its clampdown on Hong Kong.