An improvised explosive device (IED) was planted on the roadside in Margut area and was detonated when a security forces vehicle was passing by.

"The attack killed five men and two others were injured," a security official said. It was a remote control explosion which also damaged the vehicle.

No one has claimed responsibility for the attack which came days after last week's suicide bombing near an anti-polio vaccination center which killed at least 15 people.

Balochistan, of which Quetta is the capital, has been in the grip of a low-intensity armed insurgency since 2004 with ethnic Baloch nationalists and Taliban insurgents carrying out attacks.

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