Gunfire has reportedly resumed at Karachi airport in Pakistan

Video: The terminal targeted by the fighters is used for VIPs and cargo

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  Troops are rushed into Karachi International airport after an attack by 10 gunmen disguised as police guards.

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  Police help an injured colleague onto an ambulance. The militants were armed with automatic weapons, a rocket launcher and grenades.

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  As authorities scrambled to secure the area, heavy gunfire and multiple explosions could be heard coming from the terminal.

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  Police show some of the weapons seized from the gunmen.

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  Airport staff are ushered out of the terminal building.

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  Scroll through for more images from Karachi International airport.

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Gallery: Gunmen Attack Karachi Airport

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At least 23 people have been killed after gunmen disguised as police guards attacked a terminal at Pakistan's Jinnah international airport in Karachi.

Militants armed with automatic weapons, a rocket launcher and grenades stormed the airport and were involved in an intense six-hour firefight with the airport's security force, police, paramilitaries and commandos.

Ten of the dead were the attackers, according to Pakistan's paramilitary Rangers.

Also killed were at least four airport security staff, civilian airport employees and four Pakistan International Airlines (PIA) staff.

Troops joined the firefight after the major security breach

The Pakistani Taliban claimed responsibility for the attack saying it was in revenge for their late leader Hakimullah Mehsud, who was killed in a US drone strike in November.

"We have yet to take revenge for the deaths of hundreds of innocent tribal women and children in Pakistani air strikes," spokesman Shahidullah Shahid said.

"It's just the beginning, we have taken revenge for one (Mehsud), we have to take revenge for hundreds."

He also dismissed the possibility of a new round of peace talks with the Pakistan government.  

Television footage showed what appeared to be a major fire and plumes of smoke floating across the runway near parked aircraft.

Pakistan's military spokesman Major General Asim Bajwa said after the operation had ended: "Update: Area cleared. No damage to aircraft, fire visible in pics was not plane but a building, now extinguished. All vital assets intact."

Hakimullah Mehsud was killed by a drone strike last year

Maj Gen Bajwa added that ammunition, rockets and grenades were recovered from the dead attackers.

"Precautionary sweep after day light. Airport will be cleared by midday for operations, handed back to CAA (Civil Aviation Authority)/ASF (Airport Security Force). Pakistan Zindabad (long live Pakistan)!" he tweeted.

Heavy gunfire and multiple explosions had been heard coming from the airport as authorities scrambled to secure the area.

The terminal targeted by the militants was said to be used for VIPs and cargo. Passengers were evacuated and all flights diverted.

The attack will raise fresh concerns about Pakistan's security situation, and questions about how militants were able to penetrate the airport which serves one of the world's biggest cities.

Karachi has been the site of frequent militant attacks in the past.