Syria: A war within a war?
After more than two years of fighting Syrian government forces, rival opposition factions turn their guns on each other.
After more than two years of fighting the forces of Bashar al-Assad, the Syrian president, opposition fighters have started to turn their guns on each other for power and territory.
The in-fighting has led the Free Syrian Army (FSA) to reiterate their demand for more weapons from the international community. The intensified rivalry among opposition groups comes after Kamal Hamami, a member of the FSA's Supreme Military Council was shot dead in Latakia province in north Syria.
Meanwhile, on Tuesday; fighters from the Pakistani Taliban (TTP) announced they will set up a command and control centre in Syria.
The Free Syrian Army is now fighting other rebels linked to al-Qaeda for territory and control.
There are several hardline position groups fighting in Syria. The most prominent are the Islamic State of Iraq and the Levant.
The group has been responsible for the deaths of thousands of Iraqi civilians as well as members of the Iraqi government and its international allies.
By late 2012 the group was said to have renewed its strength and more than doubled its number of members to about 2,500.
And in April 2013, the group changed its name to the Islamic State of Iraq and the Levant, and became deeply involved in the Syrian civil war.
Another hardline opposition group fighting in Syria is the al-Nusra Front.
The group was established in January 2012 and since then has used car bombs and suicide attacks in its efforts to bring down the Assad government.
It has around 6,000 members, and is believed to be largely funded and trained by al-Qaeda in Iraq. In April, the head of the organisation pledged its allegiance to al-Qaeda leader Ayman al-Zawahiri.
The al-Nusra Front, being the biggest jihadist group in Syria, is often considered to be the most aggressive and violent part of the opposition.
Why on earth would we want to get involved?