For the second time in three years, the Indian city of Mumbai has been the victim of a terrorist attack. Three almost-simultaneous explosions hit the city’s financial district this afternoon, killing 21, and injuring at least 113. From the New York Times:

MUMBAI, India — Three bomb blasts shook the city of Mumbai at the height of the evening rush hour on Wednesday, killing at least 20 people in what Indian officials called a coordinated terror attack on the country’s economic capital.
The explosions struck central locations in the city, including the crowded Dadar neighborhood; the Zaveri Bazaar, a well-known jewelry market; and near the Opera House, according to India’s Home Ministry, which said 113 people had been injured.
The attack was the first in Mumbai since militants from Pakistan mounted large-scale assaults on hotels, a train station and a Jewish community center in November 2008, killing more than 160 people.
No immediate claim of responsibility for the Wednesday bombings was reported. India’s home minister, P. Chidambaram, said at a news conference in New Delhi that terror investigation teams had been dispatched to the blast sites.

As reported, no-one has yet claimed responsibility. Reuters has a good primer discussing the usual suspects, and the timing of the attack.