Firefighters held the line against a 27,000-acre arson blaze that destroyed eight homes north of San Francisco, and Oregon's worst blaze of the year was declared contained after destroying nearly $30 million worth of timberland.

After several days of cool, wet weather, firefighters were mopping up the fires that raked Yellowstone National Park, where some officials said Wednesday the damage to the environment was not as devastating as first thought.The arson fire in California's Solano County had been expected to be contained Tuesday, but winds gusting to 50 mph sent flames shooting across the lines Monday night, and the blaze burned to within a half mile of Vacaville, a city of 65,000.

It briefly threatened 50 homes in a tract west of Vacaville, but a row of bulldozers and fire engines staved off disaster, and residents have been allowed back in their homes.

The fire was expected to cover 35,000 acres before it was ringed. Containment is now predicted for Friday night. The increased acreage will include backfires set Tuesday and Wednesday to reduce the source of fuel for the fire.

In Oregon, a 9,000-acre blaze believed caused by a careless smoker was declared contained Wednesday night after destroying almost $30 million worth of valuable timberland in the Willamette National Forest.