Kabul rocked by three separate explosions

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Three separate explosions in the Afghan capital Kabul have killed at least five people and wounded two others amid a surge in violence in the war-torn country.

Police said on Saturday the first two explosions took place 15 minutes apart and a third targeting a police vehicle happened two hours later.

Spokesman Ferdaws Faramarz said no group had claimed responsibility and it was not immediately clear what caused the blasts.

The majority of bomb attacks in Kabul in recent months have been sticky bombs - explosive devices with magnets attached to vehicles and detonated by remote control or timer.

The second explosion targeted a car in a northwestern Kabul neighbourhood in which national army soldiers were travelling, killing two soldiers.

A civilian passer-by was also killed.

The third explosion destroyed a police car in western Kabul, killing two police officers.

Meanwhile, the first blast targeted a civilian car, wounding both travellers inside.

Kabul police said investigations were underway.

Afghanistan has seen a nationwide spike in bombings, targeted killings and violence on the battlefield as peace negotiations in Qatar between the Taliban and the Afghan government have stalled.

The so-called Islamic State group's local affiliate has claimed responsibility for some of the attacks but many go unclaimed, with the government putting the blame on the Taliban.

The insurgents have denied responsibility for most of the attacks.