A dangerous serac, or large block of glacial ice, is currently blocking the main climbing route to the Everest summit. This delay risks disrupting the upcoming spring summit season at the world's highest peak.

A large ice chunk is blocking the climbing route to Everest’s summit, risking delays in the summit season at the world’s highest peak, according to officials. A team of highly skilled mountaineers, known in Nepal as “icefall doctors”, began fixing ropes and ladders on Mount Everest last month to prepare for the coming spring climbing season. But a dangerous serac – a block of glacial ice – above the already treacherous Khumbu icefall has disrupted their work for nearly two weeks. “We are waiting...