Several walls collapsed at a dormitory under construction at Rice University on Thursday, killing one worker and injuring seven others, fire officials said.

The walls collapsed on the second floor around 4 p.m., trapping five construction workers, Assistant Fire Chief Omero Longoria said.

"We had to dig them out," he said.

One of the workers was dead, and four were taken to a hospital, Longoria said. The extent of their injuries was not immediately known, he said.

Three other workers were slightly injured while trying to dig out the victims and were treated at the scene, Longoria said.

All the construction company employees have been accounted for, and no one else was found in the rubble after additional searches, Longoria said.

The cause of the collapse was not immediately known, but storms passed through the area just beforehand.

Longoria said a separate investigation by the contractor and the federal Occupational Safety and Health Administration would try to determine the cause