The U.S. troops escorted the troops back to the Iraqi-Turkish border the following day without incident, a Pentagon official said.

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There was a shooting incident along the border on Friday.

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But the border blast was clearly the deadliest incident in Turkey since the Syrian uprising began 23 months ago.

CNN: STORY HIGHLIGHTS

Afghan officials say the incident began after an Afghan Border Police unit deployed on the Goshta border noticed that the Pakistani forces began additional work on fortifying their outpost, despite recent agreements to suspend such construction.

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The UK Border Agency said it had learned lessons from the incident.

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Another border guard was jailed for life for his alleged role in the incident at the Arkankergen post near Almaty, after he had reportedly confessed to the authorities.

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The Americans are still investigating an incident two weeks ago in a village near the Macedonian border, when a morning of mortar-fire wounded ten Kosovar civilians, and killed three people.

ECONOMIST: Ex-Yugoslavia

The US authorities said soon after the 10 October 2012 incident that the suspected drug smugglers first abandoned a haul of drugs, ran back across the border and then started throwing stones at the border patrol.

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