Syria remains locked in a full-on civil war.
Rebels opposed to President Bashar al-Assad lack heavy weapons.
So they're trying to compensate with home-made bombs, what American forces in Iraq would have called improvised explosive devices or IEDs.
The BBC's James Reynolds has just been to a rebel bomb factory in Turkey, just across the border from Syria.
Reynolds says these are small home-made devices, intended for use against the Syrian army.