All coalition troops at Afghan bases now armed around the clock

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The uptick in attacks by Afghan security forces against coalition troops has hit home, with all troops at NATO headquarters and all bases across Afghanistan now ordered to carry loaded weapons around the clock, CNN learned Friday.

Gen. John Allen, the NATO commander in Afghanistan, ordered the move, according to a U.S. official with direct knowledge of the orders. The order, made in recent days, was divulged amid two more so-called green-on-blue or insider attacks Friday.

An Afghan police officer opened fire on U.S. troops in Farah province in southwestern Afghanistan, killing two service members, the NATO-led command said. Two International Security Assistance Force troops and an Afghan service member were wounded by another Afghan service member in Kandahar province, in the south.

The order comes as coalition forces adopt and study measures aimed at thwarting such attacks.