At least four people have been killed and at least 60 people have been wounded after two bombs exploded in the southern Pakistani city of Karachi.



The remote-controlled devices were detonated close to two buses carrying Pakistani navy personnel during the city’s rush hour.



While attacks on government security forces are rare in Pakistan’s economic capital, the city has recently been blighted by a spate of ethnic, political and sectarian killings.



Similar assaults in other parts of the country are often blamed on the Taliban and other Islamist militants.



No group has yet claimed responsibility for the bombings.