A Kenyan official says unknown gunmen have killed a prominent businessman, who was facing terrorism related charges.
The murder in the coastal city of Mombasa comes amid a string of killings nearby of people associated with Islamic extremism.
Human rights activists are accusing the government of being behind the assassinations, since few have been resolved.
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Butt was in court in last year over allegations by authorities of incitement and funding terror related activities. In the past two years, three other well-known Muslims, who have been publicly linked to extremism, have also been killed.