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But people we spoke to have described struggling to get online to access the system, as well as finding the block system difficult to understand, notwithstanding the errors.

The vast majority made reference to the master block system.

BBC analysis has also found the IDF's block system overall was used inconsistently.

We have focused our analysis on warnings issued since 1 December, which is when the IDF launched its block system as a way of providing more precise instructions than previously, after coming under international pressure.

Vernon, Iowa, student exposure to infection is naturally limited by the school’s “block” system of classes, in which students study one subject at a time in groups of 15 for periods of three and a half weeks.