A WhatsApp message claiming 400 kg RDX in 34 vehicles pushed Mumbai into high alert ahead of Anant Chaturdashi. Police traced the sender to Noida within 24 hours and arrested a 50-year-old man, who allegedly sent the hoax to frame a friend. No explosives were found, but security stayed tight across immersion routes and key locations. A case has been filed under the Bharatiya Nyaya Sanhita.