Shortly after noon, FEMA agents began rapping on the trailer doors, their knocks resounding inside the tinny white homes. Everyone in the park, the agents announced without warning, would have to pack and leave within 48 hours.

Where do we go now?

Why?

What about school?

To the residents of the Yorkshire Mobile Home Park, all of them families displaced by Hurricane Katrina, the Federal Emergency Management Agency crews offered answers that were uncertain and sometimes contradictory. As residents spilled out of their homes to meet their similarly bewildered neighbors, the adults wondered where they would be sent next, and how far they might wind up from their jobs. Some began sobbing. Then the children, seeing their parents' tears, began crying, too. A woman fainted, and an ambulance came.

"It was like shock and awe," recalled Ron Harrell, 40, a tenant. "We called it Hurricane FEMA."

The Yorkshire residents were eventually scattered to other FEMA parks. But their sudden evacuation last weekend illustrates the upheavals that still accompany life in a government trailer park 18 months after the hurricane struck the Gulf Coast in August 2005.

About 12,000 households in Louisiana live in such settlements, temporary arrangements that only out of desperation are being stretched out indefinitely.