The shooting of unarmed protesters earlier this week sparked the worst street violence seen in two decades.
Officials have blamed Anglophone secessionists for the attack on a private school in a restive region.
Its PM condemns "aggressions" after Donald Trump says Egypt might destroy a controversial Nile dam.
Nigerian-American activist Opal Tometi co-founded the Black Lives Matter movement in 2013.
Facebook
Twitter
Pinterest
Instagram
Google+
YouTube
LinkedIn
RSS