An unspecified number of bodies have been recovered from a subway train hit by last week's bombings, but conditions underground were still "very hot, very dusty, very dangerous," police said Sunday.

The confirmed death toll from Thursday's attacks was 49, but police said it would rise after teams of police, forensic scientists and investigators remove bodies still in London's vast Underground (search) transport system.

It was not known how many bodies remained inside the Russell Square (search) subway tunnel, but difficult conditions — including temperatures that spike to 140 degrees, asbestos and rats — had been hampering the recovery effort.

Deputy Assistant Commissioner Brian Paddick of Metropolitan Police said a number of bodies had been recovered, but conditions underground were still "very hot, very dusty, very dangerous."