Three Western mayors urged their counterparts Saturday to oppose a plan that would create a national nuclear waste repository in Nevada, saying that shipping radioactive waste to the site would threaten the entire country.

Las Vegas Mayor Oscar Goodman said an earthquake centered 12.5 miles from the proposed site at Yucca Mountain on Friday reinforced his concern that the site was unsafe for storing nuclear waste.

"That's our problem," Goodman told the U.S. Conference of Mayors. "The nation, however, has a problem with transportation."

Goodman, Salt Lake City Mayor Ross Anderson and Reno, Nev., Mayor Jeff Griffin said the federal government had not done enough to study the risks posed by shipping nuclear waste to the proposed site by highway or rail.

A conference committee planned to vote Saturday evening on a resolution supported by the three mayors that would urge the Senate to reject the federal plan to bury 77,000 tons of nuclear waste in tunnels inside Yucca Mountain. The waste would remain radioactive for more than 10,000 years. The House has already approved the plan.

The conference, which drew about 250 mayors, includes a series of meetings on issues ranging from affordable housing to the environment.

The mayors also were considering several other resolutions, including one urging Washington to distribute about $3 billion in grants for homeland security directly to cities and counties rather than through the states, as Bush proposed in his budget.

"There should be no middlemen. It should go directly to the cities," said Boston Mayor Thomas Menino, a Democrat who is president of the group.

Health and Human Services Secretary Tommy Thompson told the mayors that distributing money through the states was the quickest way.

He noted that before states could receive the money, their plans for spending it had to be approved by the federal government.

"If we had to do this with all of the cities, we probably wouldn't have been able to do it," said Thompson, who was governor of Wisconsin for 14 years.

A survey of 122 mayors found that three-fourths were concerned about the threat of a chemical or biological attack, and almost four out of five said they had inadequate funding to detect threats. Three out of four said they do not have enough money for emergency response equipment or programs to protect city infrastructure.

Also scheduled to speak at the conference, which started Friday, are Homeland Security Director Tom Ridge and FEMA Director Joe Allbaugh.

The mayors' international affairs committee put off a vote on a resolution urging the administration to lift the trade embargo against Cuba and restore diplomatic relations.

The mayors met under tight security, with the city closing nearby streets as well as the shore of Lake Monona that borders the front of the convention center. Police outnumbered the handful of protesters, many of whom favored legalization of marijuana, who gathered down the block from the meeting.