Indian police have been searching the wreckage and carrying out raids in the hunt for those behind train bombings in Mumbai which killed 183 and wounded 600.

The UK’s Foreign Office has now advised travellers to India to “exercise increased vigilance” when in Mumbai in the wake of eight deadly explosions during Tuesday’s rush hour.

The Foreign Office did not rise its overall level of threat to travelers to India when it amended its travel advisory. Travel warnings are also now in place for New Zealanders heading to India.

Like Londoners and those in Madrid, commuters in Mumbai have returned to the trains this Wednesday to get to work.

In the city of 17 million trains are the main form of travel for most people in Mumbai, which is one of the most congested cities in the world.

Every day about six million people climb on to the city’s suburban railway system, which has one of the highest passenger densities of any urban railway system in the world.

Mumbai’s rail system is estimated to carry more than half of the total daily passenger capacity of the whole of Indian Railways—which is already the most extensive and most used system in the world.

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