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Syrian rebel fighters are using Facebook to buy and sell heavy weapons, guns and ammunition - including 'CIA-supplied' rocket launchers.

One post on a Facebook page shows an AGS-17 Soviet-Era grenade launcher available for $3,800 (£2,731).

One of the messages on the Facebook page says: "Quick friends, I need a gun with a silencer."

Chillingly, further investigation shows that some of the users active on the page display support for Al-Qaeda-linked jihadist groups such as Ahrar Al-Sham and the Islamic Front, prompting concerns that the weapons could easily fall into terrorist hands.

Ahrar Al-Sham have been implicated in the massacre of 190 Alawite civilians in Latakia, Northern Syria in August 2013.

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(Image: facebook)

(Image: Facebook)

The page also hosts an advert for a TOW missile launcher, which the seller claims comes from "The US Pentagon”.

TOW missiles have been controversially supplied by the CIA to selected rebel groups in Syria and Iraq since the civil war erupted in 2011.

It is believed ISIS used one of the weapons to attack an Egyptian Navy ship in September.

One seller wrote: "For sale: 105mm cannon shells. For more information, contact me on..."

One of the products up for grabs is a thermal camera - used for hunting at night - made by a US company called FLIR in Oregon - for £2,900.

(Image: facebook) (Image: Facebook)

Further posts show MANPADs, a type of missile launcher capable of bringing down both civilian and military jets, being sold for a whopping $67,000 (£48,153).

Fighters can be seen bartering in the comments section of the page - 'The First Weapons Market in Idlib Countryside’.

Sellers tell potential buyers to get in touch "in private" via Whatsapp.

A Facebook spokesperson said: “The page has been removed for breaking our policies.”