Altaf Hussain, the former leader of the Muttahida Qaumi Movement which once ruled Karachi, faces up to seven years imprisonment for the speech which was "likely to be understood" as encouraging supporters to acts of terrorism.
Fugitive head of Muttahida Qaumi Movement, who was arrested from his residence by a team of Scotland Yard, is also wanted in Pakistan in murder, terrorism, hate-speech and many other cases.
Former Pakistan President arrested on Monday over allegations he had fake accounts amid graft case in Islamabad.
Ali Raza Abidi was shot multiple times by motorcycle-borne gunmen outside his residence in southern port city, officials say, sparking widespread condemnation.
The once-charismatic leader who could amass tens of thousands with one phone call has been completely sidelined in the 2018 elections.
MQM chief seeks forgiveness for anti-Pakistan speech and inciting supporters to ransack the office of a news channel. One person is killed and a dozen others wounded, while several vehicles were torched in violence that followed the speech.
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