WARNING: VIDEO CONTAINS GRAPHIC CONTENT
Ambulances race through the streets of Karachi after a bomb exploded on Wednesday, killing at least four security officials.
Pakistani officials say that the attack targeted Sindh High Court's senior judge, Justice Maqbool Baqar.
At the scene of the attack, residents watched as security officials cordoned off the area.
The remains of burned out police vehicles littered the ground as the wounded were moved to a local hospital.
A Mosque and nearby buildings were also damaged.
No one immediately claimed responsibility for the bombing.
A city of more than 18 million, Karachi has a long history of violence.
It typically sees a dozen murders a day - a combination of political killings, street crime and attacks by the Taliban and sectarian militant groups.