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At least 29 people have been killed and more than 100 wounded after a series of explosions struck the western Indian city of Ahmedabad, officials have said.
More than a dozen blasts to have hit residential areas, crowded markets, a train station and a bus in Gujarat state's commercial capital.
It is thought the explosions were caused by crudely-made devices hidden in boxes and on bicycles.
On Friday a series of similar blasts hit the southern city of Bangalore.
The Ahmedabad explosions came in two waves - the first occurring over a 20-minute period from about 1830 (1300 GMT).
There was another series of blasts shortly after.
TV stations broadcast images of a bus with its side blown up, shattered windows and the roof half-destroyed.
Footage also showed the body of a man lying motionless on the ground next to the bus, covered in blood.
The BBC's Damian Grammaticas, in India, says the explosions appear to have been a planned and highly co-ordinated attack.
Some of the bombs in the second wave targeted the hospitals where the injured were being taken, he adds. "We saw a blue bag near the trauma centre, and before we could react we saw it explode in a shine of blinding light, and some 40 people were hit by flying shrapnel," doctor Vipul Patil, at the Dhanwantari Hospital, told AFP news agency.
Ahmedabad is an ethnically diverse city which has suffered from political instability in the past.
Riots broke out there in 2002 between Hindus and Muslims.
Reports suggested many of Saturday's blasts were in the city's crowded old quarter - a religiously-mixed area.
Analysts believe the attack may be linked to the Bangalore bombs and could be designed to whip up trouble between religious communities.
Prime Minister Manmohan Singh has appealed for people to remain calm.
India has been hit by several waves of bombings in recent years. Targets have ranged from mosques and Hindu temples to trains and courthouses.
More than a dozen blasts to have hit residential areas, crowded markets, a train station and a bus in Gujarat state's commercial capital.
It is thought the explosions were caused by crudely-made devices hidden in boxes and on bicycles.
On Friday a series of similar blasts hit the southern city of Bangalore.
The Ahmedabad explosions came in two waves - the first occurring over a 20-minute period from about 1830 (1300 GMT).
There was another series of blasts shortly after.
TV stations broadcast images of a bus with its side blown up, shattered windows and the roof half-destroyed.
Footage also showed the body of a man lying motionless on the ground next to the bus, covered in blood.
The BBC's Damian Grammaticas, in India, says the explosions appear to have been a planned and highly co-ordinated attack.
Some of the bombs in the second wave targeted the hospitals where the injured were being taken, he adds. "We saw a blue bag near the trauma centre, and before we could react we saw it explode in a shine of blinding light, and some 40 people were hit by flying shrapnel," doctor Vipul Patil, at the Dhanwantari Hospital, told AFP news agency.
Ahmedabad is an ethnically diverse city which has suffered from political instability in the past.
Riots broke out there in 2002 between Hindus and Muslims.
Reports suggested many of Saturday's blasts were in the city's crowded old quarter - a religiously-mixed area.
Analysts believe the attack may be linked to the Bangalore bombs and could be designed to whip up trouble between religious communities.
Prime Minister Manmohan Singh has appealed for people to remain calm.
India has been hit by several waves of bombings in recent years. Targets have ranged from mosques and Hindu temples to trains and courthouses.
