Ben Hope and Jason Richards, the killers of Cardiff A-Level student Aamir Siddiqi, have each received a life sentence in jail.
The judge at Swansea Crown Court told them they must each serve a minimum term of 40 years.
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Evening sunshine will give way to a dry and clear night with light winds.
A survey found the posts included comments about the teachers competence, and appearance.
Temperatures will rise steadily in the strong June sunshine.