Undercover footage shot by Global Witness, a non-governmental organisation working against environmental exploitation, appears to link a leading Malaysian politician to corrupt land deals worth at least $500m.

Abdul Mahmud Taib, who did not respond to Al Jazeera's request for an interview, has been the chief minister of Sarawak state for over 30 years.

Florence Looi reports from Sarawak.

Source: Al Jazeera