A series of blasts took place at Matunga, Khar, Santacruz, Jogeshwari, Borivali and Bhayendar suburban railway stations on Tuesday evening.
Several persons were killed in the blasts.
All the explosions took place in first class compartments of trains at a time when a majority of Mumbaikars were return home from office.
Eyewitnesses said a large number of people were seriously injured and all trains on the Western line route had been suspended.
A PTI reporter at Santa Cruz station said a blast rocked Borivali-bound local at 6:24 p.m. and seven to eight injured were taken to nearby hospitals.
The explosion occurred in the first class compartment of the train and several passengers were jumped out of the speeding train in panic.
Around 12 to 15 persons injured at Santa Cruz station were taken to nearby V N Desai Hospital and the entire first class bogey had been emptied.
All local phones, including mobile services, in the city had jammed apparently due to congestion in the system as anxious people tried to reach their loved ones.
Another 20 injured were admitted to the KEM hospital in Central area of Parel, hospital sources said.
Police cordoned off all railway stations on the western line and strict frisking and checking were carried out at the Central and Harbour sections of local trains services.
All trains on the Western line route have been suspended.
Phone services in the city have been jammed due to congestion in the system as anxious people are trying to reach their loved ones.
Major cities, including New Delhi and Bangalore, and all major airports in the country have been put on high alert.
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