LONDON, AP -British police said they arrested three people Sunday at Heathrow Airport under the country”s anti-terrorism laws but refused to link the suspects to last week”s bombings in London.

Deputy Assistant Commissioner Brian Paddick of the Metropolitan Police it would be &#34inappropriate and pure speculation to draw any direct linkages to the attack in London.&#34 Police said the three were arrested earlier Sunday.

Paddick also said earlier that an unspecified number of bodies have been recovered from a subway train hit by the blasts, but conditions underground were still &#34very hot, very dusty, very dangerous.&#34

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 transport system.

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