Fox News reports between 41-45 dead and toll will likely rise, plus large number of wounded casualties–more than 300. The round-up:

Death toll rises in London explosions

Death toll in London attacks rises to 12

Reuters: At least 90 casualties at Aldgate station: Doctor

At least 90 casualties were being treated near Aldgate underground station in London after a large explosion, a doctor treating the injured said. “We have been helping with the walking wounded, there are three whole bus loads full of them,” said Doctor Diane Keith, who estimated that there were around 30 people on each bus.

The Guardian blog reports at least 41 dead and possibly 1,000 wounded.