Saudi is sandwiched between Jihadis in Iraq and Yemen, and the young men they've exported to other parts of the Middle East to learn the killing arts might decide to come home one day:
"Along Saudi Arabia's long, lonely desert border with its northern neighbour Iraq, the Ministry of Interior guards have every reason to stay alert.
"Isis, the well-armed and well-funded jihadist army that has seized control of most of western Iraq, is now effectively at the kingdom's doorstep.
"Nearly half the 900km (560 mile) Saudi-Iraq border is with Iraq's Anbar province where The Islamic State in Iraq and the Levant (Isis), now rebranded as simply 'The Islamic State', is largely able to move its fighters around at will.
"Saudi Arabia may not yet be directly in its sights but officials fear this is only a matter of time..."
"For the Saudi authorities, the situation bears an uncomfortable similarity to what they were facing a decade ago.
"Iraq was in turmoil following the US-led invasion and the dismantling of its central government, droves of young Saudi men were fulfilling what they believed was their religious duty and heading over to Iraq to wage jihad, a holy war.
"Today, despite government-approved fatwas forbidding such actions, a number of Saudis have been able to reach Syria and Iraq to join Isis.
"Saudi accents have been heard commentating, out of vision, on some of the group's chilling videos of captured Iraqis being executed in cold blood.
"For the Saudi authorities, returning jihadists represent a potential domestic security threat if and when they do come back.
"That said, many who survive the fighting may choose to either remain in Isis-controlled territory or make their way to Yemen to swell the ranks of AQAP."
BBC News - Saudi Arabia: Sandwiched by jihadists in Iraq and Yemen
