The Mumbai police are on high alert after receiving a threat message claiming that 14 terrorists had entered the city with 400 kg of RDX and planted them in vehicles, a police officer said on Friday.

As the police make security arrangements for Anant Chaturdash, the 10th day of the Ganesh festival, the traffic police control room on Thursday received a threat message on their WhatsApp helpline, the official said. 

He said that the Crime Branch has launched an investigation into the threat, and the Anti-Terrorism Squad (ATS) and other agencies have also been informed.