Terming as "disturbing" the killing of social activists Narendra Dabholkar and Govind Pansare, the Bombay High Court today said sincere efforts were needed to investigate both the cases and sought their progress reports.

A division bench of justices R V More and R G Ketkar granted four weeks time to the CBI, which is probing the Dabholkar murder, and to a Special Investigating Team (SIT) of the state CID, probing the Pansare murder, to file their progress reports.