After arrest news of Mutahidda Qaumi Movement leader Altaf Hussain spread in the metropolitan, people were seen in panic as many rushed back to their homes from offices.
There were reports of forced shutter down in few areas of Karachi.
Sporadic firing incidents in Nawab Shah were also reported, though not confirmed.
Karachi stock exchange crashed 750 points as well.
Altaf Hussain was arrested by London Met Police this morning in money laundering case.