"The next steps for NASA under (administrator) Sean O'Keefe's leadership must be determined after a thorough review of the entire report, including its recommendations," he said in a statement released by the White House.

"Our journey into space will go on," vowed Bush, who was here to raise funds for his 2004 reelection bid. "The work of the crew of the Columbia and the heroic explorers who traveled before them will continue."

The official inquiry into what led to the shuttle's breakup during its February 1 re-entry to the Earth's atmosphere said that NASA managers were "as much a cause" of the tragedy as technical faults.

The Columbia Accident Investigation Board (CAIB) report said a piece of foam that broke off during take off pierced the shuttle's protective skin causing the overheating that led to the disaster.

All seven astronauts on board, including the first Israeli in space, were killed.

"These men and women assumed great risk in service to all humanity. On behalf of a grateful Nation, I once again recognize their sacrifices and those of their loved ones. Their service will never be forgotten," said Bush.

SPACE.WIRE