President Bush called Tuesday on all nations to step up efforts to end the genocidal killing in Sudan's western Darfur region "once and for all."

Speaking in Rwanda, wracked in 1994 with its own genocide, the president said the U.S. will use sanctions, pressure and money to help resolve the Darfur crisis. But Bush has been frustrated at the lack of willingness in some countries to do the same and sought to give his campaign for increased involvement added weight by making remarks in the Rwandan capital of Kigali.

"The Rwanda people know the horrors of genocide," Bush said. "My message to other nations is join with the president and help us get this problem solved once and for all."

Rwanda was the first to deploy peacekeepers to the violent Darfur region in a joint African Union-U.N. mission. The United States has trained nearly 7,000 Rwandan troops and spent more than $17 million to equip and airlift Rwandan troops into the region.

Bush announced the United States would spend another $100 million to train and provide equipment for peacekeepers from several African nations deploying to Darfur.

"I'm not comfortable with how quick the response has been," the president said.

Bush spoke after a somber visit to the haunting Kigali Memorial Centre, where exhibits tell the story of Rwanda's genocide as well as other ethnic slaughter around the world. Mass graves on a trellis-covered hilltop hold some remains of about 250,000 people. Over 800,000 Tutsis and moderate Hutus were shot, clubbed and hacked to death in just 100 days by extremist Hutu militias incited by the then-government.

"It's a moving place. It can't help but shake your emotions to their very foundation," Bush said after walking through its rooms and gardens. "There is evil in the world and evil must be confronted."