Case pertaining to the theft of key documents in Adarsh Housing Society scam was on Sunday transferred to the Mumbai Crime Branch due to seriousness of the issue.

“The case has been transferred to the Crime Branch. This special wing is working on the case and have asked for the FIR details which was registered in the local police station,” a crime branch official said on condition of anonymity.

The Crime Branch of the city police usually probes underworld-related or sensitive in nature cases.

A case of theft was registered on Saturday by police after crucial documents from 10 files on Adarsh Society went missing from the the Urban Development Department in Mumbai.

Secretary of the department Gurudas Bajpe gave a written complaint to the Marine Drive police on Friday night about the missing papers.

The disappearance of the papers has been brought to the notice of CBI, which is probing into the scam, where flats built in the name of Kargil war heroes were alloted to bureaucrats, politicians’ relatives and defence officers.

The missing papers include remarks of the state government officials and Chief Minister.