UBS issued an announcement late Tuesday morning that it had lifted the travel advisory to its staff. The announcement hinted at uneasiness about the attention that the advisory had drawn, noting that, “UBS has had a strong franchise in China for 30 years and remains fully committed to further developing our business on the mainland.”

The bank had no further comment on the whereabouts of its Singaporean banker.

The advisory came as Xi Jinping has embarked on an extensive anticorruption campaign in the six years since he became China’s leader as the general secretary of the Chinese Communist Party. The campaign has also been used to enforce political loyalty to him.

A growing number of multinational companies have begun reviewing and sometimes tightening their travel policies on mainland China. Some of these have been victims of Chinese industrial espionage or trade violations, such as dumping or export subsidies.

“As the crackdown has intensified we’ve seen more frequent cases where foreign firms introduce temporary, precautionary restrictions for a specific reason — usually involving the possibility of staff detention in connection with investigations,” said Andrew Gilholm, a Shanghai-based analyst with Control Risks, a global consulting company.

The Chinese government has also prevented the departure of members of the families of people living in the United States. That has become a popular way to put pressure on overseas targets of investigations for them to return to China even when Beijing does not have enough evidence to extradite them.