Gunmen have shot dead at least 17 people in fresh violence in the Pakistani city of Karachi.
A television journalist was among the dead after the attack in the country's commercial hub.
"At least 17 people have died in the past three days by firing by unknown gunmen in several parts of Karachi," the city police chief, Fayyaz Leghari, said.
After hundreds of killings last year, there are concerns that violence in Pakistan could escalate and create a new crisis for the US-backed government.
Analysts and security officials blame much of the trouble on the rivalry between the two main parties, the Muttahida Qaumi Movement, and the Awami National party, both part of the ruling coalition.
The MQM represents the interests of majority Urdu-speaking mohajirs, while the ANP is linked to the growing Pashtun minority. Conflicty between party members is partly fuelled by ethnic tension.
The Pakistani government also faces a Taliban insurgency.
Eight gunmen in the south-west of the country have torched 14 tankers carrying fuel for US and Nato troops in Afghanistan.
A driver was wounded during the latest attack, which occurred in the Dera Murad Jamali area of Balochistan province, government official Fatteh Mohammed said.
The tankers were parked at a roadside restaurant when the attack occurred.
Such attacks by Islamic militants and criminals on supplies, which usually arrive in the port city of Karachi and travel overland to Afghanistan through two main border crossings, have become common.
As a result, the US has been relying on other supply routes through countries north of Afghanistan.
Pakistan shootings and tanker attacks fuel crisis fears | World news | guardian.co.uk
what attacks on NATO supplies have to do fuel crisis in Pakistan ? lolzzzzzzzzzzzzz
