Three near-simultaneous explosions have shaken India's commercial capital Mumbai (Bombay), police say.
Police told local media that eight people had been killed and more than 100 wounded in the rush-hour blasts.
One explosion was reported in the Zaveri Bazaar, another in the Opera House business district and a third in Dadar district.
Indian media have quoted the home ministry as saying the explosions were a terrorist attack.
Police sources were reported as saying the explosions were caused by home-made bombs.
Mumbai was the scene of a 10-man raid and co-ordinated attacks in November 2008 in which nearly 170 people were killed.
The latest explosions hit the city around 1900 local time (1330 GMT) as workers were making their way home.
While the Home Secretary said two people had been confirmed killed, police said eight people had died.
The city has been put on a state of high alert.
The authorities have not yet said who they believe might be behind the explosions and no group has said it carried them out.
The explosion in Zaveri Bazaar, in the south of Mumbai, was reported in a jewellery shop, says the BBC's Rajini Vaidyanathan in Mumbai.
The third explosion hit the Opera House district, also in the city's south, at a time when it would have been crowded with workers and commuters.
The blast in Dadar district, in the city centre, went off in a taxi next to a bus stop.
According to some reports, the blasts came on the birthday of Mohammad Ajmal Amir Qasab, the sole surviving gunman from the 2008 attacks.
Those attacks, which targeted two high-end hotels, a Jewish centre and other sites frequented by foreigners, were blamed on the Pakistan-based Lashkar-e-Taiba militant group.
