Who is arming the Syrian conflict?

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(CNN) -- Syria's shelling of a border town in Turkey has sparked fears that President Bashar al-Assad's attempt to snuff out a rebellion at home could turn into a damaging regional war between the two neighbors.

Five civilians, all women and children, in the town of Akcakale were killed by Syrian artillery rounds in the worst single case of violence on the Turkish side of the border since Syria's unrest began last year.

While Syria hasn't confirmed its motive for firing into Turkey, rebels fighting an 18-month war against the Assad regime have allegedly been using positions on the Turkish border as a safe haven to regroup and re-arm following battles with Syrian troops.

Another explanation, says one expert, is that in a cat-and-mouse pursuit to neutralize rebel groups near the border, Syrian artillery units simply overshot their target. Read More