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A policeman was killed and five other people, including two police, were wounded in a bomb attack targeting a police van in the Pakistani port city of Karachi on Thursday, officials said.
"A low-intensity remote-controlled bomb planted on a footpath exploded in Orangi town injuring six people, including three of our officials. One policeman died in a hospital," police official Naveed Nasir told AFP.
"Another police official is in critical condition," he said.
Orangi is an impoverished neighbourhood in the west of the city.
"We can't say who is behind this attack, but it is certainly a part of the terror campaign aimed at police officials that has killed and injured scores in the last two months," said another official Ahmed Khan.
At least 10 people have been killed in acts of violence in the city since late Wednesday, said a security official who wished not to be named.
Ethnic, sectarian and politically-linked violence in Pakistan's financial capital killed at least 2,284 people in 2012 in the deadliest such violence for two decades, according to the independent Human Rights Commission of Pakistan.
The unrest comes with general elections due by mid-May. The polls will mark the first democratic transition between two civilian governments in Pakistan's history.