NEW DELHI: Security has been tightened across Mumbai after the city’s Traffic Police received a threat message on their official WhatsApp number, claiming that multiple terror attacks were being planned.According to police, the message stated that 34 vehicles in the city had been fitted with “human bombs” and warned that the blasts would “shake entire Mumbai.” The organisation behind the threat identified itself as ‘Lashkar-e-Jihadi’, further claiming that 14 Pakistani terrorists have entered India.The threat also stated that 400 kg of RDX explosives would be used in the attacks.Mumbai Police have confirmed they are investigating all possible angles of the threat message.