Well, Alex, this goes back to 2003, to an incident at a remote U.S. army base in the Afghan mountains.

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Nato said that the attackers succeeded in breaching the outer perimeter of the base but no coalition soldiers were killed in the incident.

BBC: Militants kill Afghan policemen at Kandahar checkpoint

It is the first time Harry, who was speaking from Camp Bastion, the main British military base in Afghanistan, has talked in public about the Las Vegas incident.

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In another incident, an Afghan driver raced in a stolen vehicle towards 200 marines at a southern base, as the American defence secretary's plane was landing there.

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Using a public address system, police announced a base lockdown as the shooter holed up in a room in barracks near the first incident.

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In a separate incident on Monday, officials say that insurgents were foiled as they tried to storm a joint Afghan-Nato base in the Shah Wali Kot district of Kandahar.

BBC: Militants kill Afghan policemen at Kandahar checkpoint