The alert was issued following a series of terror threats that were made to the country's commercial capital, which had also seen a number of attacks in the last two decades. The city police has stressed installation of CCTV cameras and better communication.
The police has taken a couple of anti-terror initiatives, known as Operation Bravo and Mumbai Kavacch. The police stations across the city will also have anti-terror cells.
Strict guidelines have been issued for malls and multiplexes while an initiative has been taken to deploy armed private security guards in shopping malls.
Identity cards with biometric features have been made mandatory for all mall employees while the authorities have been asked to check the background of their employees every three years and keep the police updated.
The city hospitals have also been asked to make adequate security arrangements at each floor and keep a record of all entering their premises.
The hotels have been asked to stop suspected vehicles from entering and also to keep CCTV footage records for 30 days. The police have also asked the schools to improve their security arrangements.