China is investigating US hotel chain Marriott International for allegedly listing Hong Kong, Macao, Taiwan and Tibet as individual nations in a survey.

The Shanghai Huangpu District government released a notice on its Weibo account on Wednesday, ordering Marriott to remove all the relevant content immediately and examine all the information posted on its website and apps to prevent future mistakes.

According to the notice, Marriott is suspected of violating China's network security and advertisement law. The Huangpu District market surveillance bureau is investigating the case.

Chinese netizens also criticized Marriott, and have called for a boycott of the company.

Marriott issued an apology on Tuesday via its Weibo account Marriott Reward, saying it is “deeply sorry for the incident and has suspended all email surveys to adjust the survey options,” and another apology on Wednesday, reiterating it has always respected China's sovereignty and has stopped all email surveys.

Statement from Shanghai Huangpu District government / Weibo photo

Marriott Reward posted late on Wednesday night that it had fixed all the problems on its Chinese and English websites, and updated the company's app as well.

The company is also cooperating with the government investigation.