Congress leader Shashi Tharoor has called for a thorough investigation into the claim made by another Congress leader, Vijay Wadettiwar, that former Mumbai Anti-Terrorism Squad (ATS) chief Hemant Karkare was killed by a police official close to the Rashtriya Swayamsevak Sangh (RSS) during the 26/11 terrorist attacks, and not by terrorists. This allegation is based on information presented in a book by former Inspector General of Police SM Mushrif. Tharoor emphasizes the importance of investigating such a serious matter to ensure transparency and accountability.