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Updated: Jun 09, 2014 08:40 IST

Gunmen disguised as police guards attacked a terminal at Pakistan's busiest airport on Sunday with machine guns and a rocket launcher during a five-hour siege that killed 13 people as explosions echoed into the night, officials said.

"All 10 terrorists have been killed, the airport secured and they were unable to damage any aircraft or installations," a spokesman of the Inter Services Pubic Relations (ISPR) said. A Pakistani official said the siege at Karachi airport was over.

According to reports, Tehreek-e-Taliban has claimed responsibility for the attack on the Jinnah International Airport in Karachi. The attacks come as government-led peace talks with the local Taliban faction and other militants have floundered in recent weeks.

Pakistani media, however, reported at least 23 people were killed, including all 10 of the attackers.

A separate suicide bombing in the country's southwest killed 23 Shiite pilgrims returning from Iran, authorities said.

The airport attack began late Sunday and continued on into the dawn hours of Monday in Karachi, a sprawling port city on Pakistan's southern coast, although officials said all the passengers had been evacuated. During the course of the attack, heavy gunfire and multiple explosions could be heard coming from the terminal, used for VIP flights and cargo, as militants and security forces battled for control. A major fire rose from the airport, illuminating the night sky in an orange glow as the silhouettes of jets could be seen.

The deadly operation was carried out by 10 militants, said the chief minister of Sindh province, Qaim Ali Shah.

"They were well trained. Their plan was very well thought out," he told reporters. He said they intended to destroy some of the aircraft and buildings but were not able to.

The spokesman for the Pakistani military, Gen. Asim Bajwa, said on Twitter that no aircraft were damaged and that as a precautionary measure, security forces were sweeping the airport before operations would be returned to the civil aviation authority and airport police.

Scene at Jinnah International Airport after the attack (Source: Twitter @akchisti) Scene at Jinnah International Airport after the attack (Source: Twitter @akchisti)

At least some of the gunmen wore the uniforms of the Airport Security Force that protects the nation's airports, said an official who briefed journalists near the airport. He said all were strapped with explosives. He said one of them tried to capture a vehicle used by the civil aviation authority and when a guard shot at him, the explosives strapped to his body went off. The official said another attacker also blew up after being shot at by security forces.

The official described himself as being with one of the country's intelligence agencies but declined to give his name.

After storming into the airport grounds, gunmen took shelter in two sections of the airport, said senior police officer Ghulam Qadir Thebo.

"The blast you heard a little while ago was when our police party went to pick up a body (and) one of the attackers blew himself up," Thebo said

Authorities seized four machine guns and a rocket launcher, Thebo said. He said the billowing smoke and flames was from oil that had caught fire.

Dr. Seemi Jamali from Jinnah Hospital in Karachi said 13 bodies had been brought to the hospital from the fighting. She said nine were Airport Security Force personnel, one was a member of the paramilitary Rangers, one was from the police, one was an employee of the Civil Aviation Authority and another was from the state-run Pakistan International Airlines.

Authorities diverted incoming flights and suspended all flight operations. A spokesman for the Civil Aviation Authority said the airport would be closed until at least Monday night.

Sarmad Hussain, a PIA employee, told The Associated Press he was at the airport at the time of the attack.

Google map view of the Karachi airport. (Source: Google Maps) Google map view of the Karachi airport. (Source: Google Maps)

"I was working at my office when I heard big blasts - several blasts - and then there were heavy gunshots," Hussain said. He said he and a colleague jumped out of a window to get away, and his colleague broke his leg.

Karachi is Pakistan's largest city and has been the site of frequent militant attacks in the past. It is the country's economic heart and any militant activity targeting the airport likely would strike a heavy blow at foreign investment in the country.

In May 2011, militants waged an 18-hour siege at a naval base in Karachi, killing 10 people in an assault that deeply embarrassed the armed forces.

There was no immediate claim of responsibility for Sunday night's attack. Pakistan's government has been trying to negotiate a peace deal with local Taliban fighters and other militants mostly based in the northwest who have been waging war against the government. But the talks have had little success, raising fears of a backlash of attacks across the country.

Security officials in Karachi had feared that if the talks broke down, their city would be a likely spot for any militant retribution. The Pakistani Taliban and their allies increasingly are gaining a foothold in Karachi.

A file picture dated 08 February 2011 shows a general view of Jinnah International Airport in Karachi, Pakistan. (EPA photo) A file picture dated 08 February 2011 shows a general view of Jinnah International Airport in Karachi, Pakistan. (EPA photo)

In the suicide bombing, four bombers targeted Shiite pilgrims staying at a hotel in the town of Tuftan near the Iranian border, said Balochistan province Home Minister Mir Sarfraz Bugti. One bomber was killed by security officials traveling with the pilgrims, but the other three managed to get inside the hotel where they blew themselves up in an attack that also wounded 10 people, he said.

It wasn't immediately clear whether there was a connection between the airport assault and the Balochistan attack. But the attacks were sadly familiar for Pakistan, which has seen thousands killed by militants in recent years.

Shahid Ali, who dropped his mother and father off at the airport prior to the attack, said they were onboard a flight when the attack began. Ali said the flight, heading to Iraq, later returned to the terminal without being told what was going on. He said his parents joined other passengers waiting in a lounge.

He said his parents were not panicked.

"We are used to this," Ali told the AP.

(With inputs from agencies)