A Pakistani passenger leaves Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Pakistani passengers gather at Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Pakistani passengers arrive at Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Pakistani passengers wait at Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Pakistani passengers gather under flight electronic board at Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Pakistani passengers arrive at Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Taxi drivers wait for passengers outside Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Pakistani passengers gather at Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)

Pakistani passengers wait at Jinnah International Airport after militants attack in southern Pakistani port city of Karachi on June 9, 2014. The Jinnah International Airport in Pakistan's southern port city of Karachi reopened to passengers on Monday afternoon following Sunday night's terrorist attack that killed 23 people, local media and officials said. (Xinhua/Masroor)