Climbers unable to confirm Everest achievement

An expedition on Mount Everest retracing the 1924 climb by George Mallory and Andrew Irvine returned from the mountain today unable to say whether the two men were the first to scale the world's highest peak.

Climbers from the Altitude Everest Expedition 2007 returned to the Nepalese capital Kathmandu today after reaching the 29,035-foot summit from the Chinese side of the mountain in the north and filming a documentary.