Japanese officials have raided the facilities of a doomsday cult linked to the 1995 gas attack on the Tokyo subway.

The huge operation comes one day after the country's top court upheld the death penalty for the group's former leader.

About 250 inspectors entered 25 facilities around the country Saturday to check for dangerous activities by members of the cult previously known as Aum Shinrikyo. The cult has since renamed itself Aleph.

On Friday, Japan's Supreme Court rejected the final appeal of the death sentence given to Shoko Asahara. He was sentenced to death in 2004 for crimes including masterminding the poison gas attack on the Tokyo subway. Twenty-seven people were killed in the crimes. The gas attack alone killed 12 people and made thousands ill.

Some information for this report provided by AP and Reuters.