Three explosions rocked crowded districts in India's largest city Mumbai last night, killing at least 17 people and injuring more than 100. The death toll was originally given as 21 but was later revised down.

India's home ministry has called the co-ordinated blasts a “terror attack”, the first in India's financial hub since militant gunmen laid siege to the city three years ago, killing more than 160.

One explosion was in the busy central Mumbai neighbourhood of Dadar, another at the Jhaveri Bazaar, while the third was at the Opera House district, popular with tourists.

The Opera House blast was the most powerful, police said, but all three areas were reportedly busy with rush hour commuters at the time of the explosions.