Security has been increased all over Mumbai following a threat message to the city's Traffic Police on their official WhatsApp number, stating that several terror attacks were being planned.

The message, as per the police, stated that 34 vehicles in the city had been equipped with "human bombs" and warned that the blasts would "shake entire Mumbai."

When the police were arranging security for Anant Chaturthi, the 10th day of the Ganesh festival, the traffic police control room on Thursday received a threat message, an official told news agency PTI.

He said the Crime Branch has initiated an investigation into the threat, and the Anti-Terrorism Squad and other agencies have also been informed.

The organisation behind the threat identified itself as 'Lashkar-e-Jihadi', further claiming that 14 Pakistani terrorists have entered India.

The threat also mentioned that 400 kg of RDX explosives would be used in the attacks.

As Mumbai prepares itself for the culmination of the 10-day Ganesh festival on Saturday, the police have tightened security to manage the lakhs of devotees expected to throng the streets of the city.

A security official said that security was intensified at sensitive locations, with combing operations underway to prevent any untoward incident.

Authorities are also investigating the source of the suspicious message that appeared during the festival period.

Police have urged citizens not to fall for rumours and to promptly report any suspicious activity, assuring that all measures are being taken for a safe and peaceful celebration.