As China grapples to contain a mortgage boycott that has triggered rare protests, censors have gone into overdrive with social media messages blocked, videos of demonstrations wiped and keyword searches coming up blank.

Censors are scrambling to filter or erase details of angry homebuyers threatening to stop paying mortgages on hundreds of unfinished housing projects, as regulators seek to reassure residents that everything will be taken care of.

The protests have erupted at a sensitive time for Beijing. Chinese President Xi Jinping is expected to secure a third leadership term at the 20th Communist Party Congress later this year, and social stability is crucial ahead of the meeting.