Ayatollah Khamenei: Why is Muslim world silent towards the oppression in Nigeria?

In Nigeria, why do they create such disasters for that peaceful, conciliatory and believing Sheikh [Ibrahim Zakzaky]?
Why do they murder about 1,000 people who are close to him?
Why do they martyr his six children in the course of two years?
Why does the world of Islam remain silent in the face of such crimes? ...

Is this to the interest of the world of Islam? ... Enemies' goals are dangerous goals. They are devised in their – as they say – “think tanks”. We should be awake.

~Ayatollah Khamenei, December 29, 2015