BREAKING: Huge Explosion ROCKS Kabul Airport

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DEVELOPING STORY: There was an explosion outside the Abbey Gate at Kabul’s airport in Afghanistan, U.S. officials confirmed. It’s not clear how many people are potentially injured or killed.

A U.S. official described it as a suicide bomb attack that set off a firefight at Abbey Gate, where last night, there were 5,000 Afghans and potentially some Americans seeking access to the airport.

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The explosion – it’s unclear how big it was – comes hours after the State Department warned Americans outside the gates of the Kabul airport to “leave immediately” due to the increasing terrorist threat, Fox News reports.

The blast happened at one of the entry gates of the airport and appears to be a suicide attack, three US officials told CNN.

Crowds of Afghans have been gathering at the gates trying to gain access to the airport.One official said there are injuries among Afghans, but there is no information yet on any US casualties.