Three explosions were reported in India's business capital of Mumbai Wednesday, police said.
Delhi-based TV station NDTV reported eyewitnesses as saying that they thought at least four people had been killed, with 15 to 20 others taken to hospitals.
An official at the city's police control room said one blast was in the crowded neighborhood of Dadar in central Mumbai.
The others were at the famed jewelry market Jhaveri Bazaar and the busy business district of Opera House.
The Times of India newspaper reported that a National Investigative Agency team had been sent to Mumbai and that all states in the country had been put on high alert.
No other details were immediately available.