Italian glacier collapse: rescuers hampered by thunderstorms

Visiting scene, Italian PM says country must take measures to ensure such a tragedy does not happen again

Thunderstorms have hampered the search for more than a dozen hikers who remain unaccounted for a day after a huge chunk of an Alpine glacier in Italy broke off, sending an avalanche of ice, snow and rocks down the slope.

The Italian prime minister, Mario Draghi, pledged on Monday night that his government would work to avoid a repeat of the tragedy in which at least seven people were killed.