A bomb attack targeted a senior judge in Karachi on Wednesday, killing at least four people on a busy street during morning rush hour in Pakistan's business capital, officials said.
The bomb detonated as Maqbool Baqir, a senior judge at the high court of southern province Sindh, where Karachi is the main city, drove past with his security detail in Burns Road.
"At least four people have died in the Burns Road attack and several others are injured," police official Salman Syed told AFP.
Baqir was rushed to hospital with critical injuries and his driver was killed, police said.
"We can't give an exact number of wounded at the moment. But I can confirm that Justice Maqbool Baqir is critically injured," Syed said.
Police said Baqir was the target.
"At the moment we can't determine whether it was a suicide attack or a planted bomb," senior police official Ameer Sheikh told AFP.
Baqir has a reputation for honesty and has also served as a judge in special anti-terrorism courts set up in Pakistan to pass down quick punishments to convicted terrorists.
Karachi, a city of 18 million people, contributes 42 percent of Pakistan's GDP but is rife with murder and kidnappings and has been plagued for years by ethnic, sectarian and political violence.