Heavily armed militants first seized a vehicle belonging to the government power utility in the Kurram region and kidnapped four people travelling inside. The vehicle was set on fire.
Shortly afterwards, several vehicles were seized from a convoy of civilians travelling to Parachinar, the main city in Kurram.
Officials initially said 30 people were kidnapped but later said 57 people had been taken from the convoy.
"The militants were posing as policemen and wearing police uniforms," said Mir Chaman, a senior police official in the nearby town of Thal.
Meanwhile, WAPDA officials have confirmed the kidnapping of two of their officials.
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