(BBC News) Protesters shouting "no justice, no peace" have disrupted a speech by former FBI director James Comey to university students in Washington DC.
Mr Comey was giving a convocation address at Howard University, a leading historically black college.
It took some 13 minutes before Mr Comey, fired in May as head of the FBI, could be heard by the crowd of 1,500.
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From the moment he took the podium he was distracted by chants including "Get out James Comey, you're not our homie".