Latest from Mumbai (1:17 p.m. local time; 7:47 a.m. in Britain)

Not much change in a tragic and tense situation. Struggling for new information, broadcast news organisations are filling time with eyewitness accounts, especially from those who were in the Taj and Oberoi hotels, and comments from experts who really have little to add.

More than 100 dead and more than 300 injured. The Times of India, relying on Indian military sources, says four terrorists are still inside the Taj Hotel, along with 40 to 50 trapped guests. Twitter feed indicates explosions and gunshots at Oberoi Hotel.

While the conflict continues, it is unclear who is behind the attacks. The "Deccan Mujihadeen" have claimed responsiblity. Given the level of coordination and range of targets and given that no security services have previously known of the group, it is unlikely that they are the culprits.

Mumbai Attacks: 80 Dead, 900+ Injured, 40 Hostage

The Times of India reports that the coordinated attacks targeted hotels, hospitals, railway stations, cinemas, and a large market. The head of state the anti-terror squad is among the dead.

Attackers are still inside a hospital and holding hostages in two five-star hotels, Twitter reports indicate a rescue attempt to free hostages at the Taj Hotel.

An unknown group called the Deccan Mujahideen have claimed responsibility for the attacks.

Breaking News: Mumbai Hotel Attacks

A series of coordinated gun and grenade attacks have killed at least 55 people in Mumbai. Ongoing battles are reported at two five-star hotels.

The attacks began about two hours ago. It is still unclear who the assailants are. Internet reports indicate senior police officers, including prominent "encounter specialist" Vijay Salaskar, have been killed.

Ongoing discussion of the situation can be followed at Twitter. An eyewitness, Gaurav Sikka, is providing a running account on the site.

UPDATE (Mike):

Vinu has photos from Mumbai, which appear to show an explosion that's taken place in or near a petrol station.

UPDATE 2 (Mike):

The BBC is reporting all kinds of hotel attacks, but Twitter user shivmeet tells me that the Oberoi and the Trident are in fact the same hotel. I also think the Taj and the Ramada are the same place.