Weak climbers being led up Mount Everest by expedition operators with insufficient experience are causing problems, a veteran mountain guide said on Sunday, after one of the deadliest climbing seasons in years on the world's highest mountain.
At least 12 climbers died and five are missing and feared dead on the 8,849 metre (29,032 foot) Mount Everest during this year's main climbing season that has just ended, the deadliest since an earthquake triggered an avalanche that killed 18 people in 2015.
