NEW DELHI: A group of United States trained and backed Syrian rebels have handed over vehicles, ammunition and equipment received from the US to fighters linked to Al Qaeda, the US military has admitted.

Reports indicate that one rebel group handed over six pickup trucks and ammunition to the al-Nusra Front this week, in a bid to gain safe passage.

"Unfortunately, we learned late today that the NSF (New Syrian Forces) unit now says it did in fact provide six pick-up trucks and a portion of their ammunition to a suspected al-Nusra Front (group)," Pentagon spokesperson Cpt Jeff Davis confirmed on Friday.

Col Patrick Ryder, a spokesperson for US Central Command (Centcom), said that the incident took place September 21-22. The surrendered equipment and ammunition amounts to about 25 percent of the equipment issued to the unit, the Colonel said. "If accurate, the report of NSF members providing equipment to al-Nusra Front is very concerning and a violation of Syria train-and-equip programme guidelines," he said.

Centcom had originally denied that the equipment had been handed over to the jihadist group. Al-Nusra tweeted a photo of a rifle issued by US coalition forces earlier in the week, but Central Command had said that the photo was a fake.

The confirmation points to a long suspected and very dangerous trend regarding the conflict in Syria and Iraq. The US Congress has approved $500m to train and equip about 5000 rebels fighting the Islamic State (also known as Daesh), thereby heavily militarising the conflict zone. The reality is that cadres of fighters often switch loyalties in these conflict zones, taking the weapons with them. At other times, equipment and weapons are used as barter material, making their way into the hand of the ‘enemy’ as has happened in a confirmed incident this week.

This is not the first time that reports have emerged of ‘enemy’ groups acquiring US arms and ammunition. During the battle for Kobani, Daesh published a video in which a fighter showed off boxes of munitions with English-language markings that he claims were dropped by American forces. “This is some of the military equipment that was dropped by American forces… these are the bombs that the American forces dropped for the Kurdish parties… they are spoils of war for the Mujahedeen,” the fighter said, indicating that Daesh had acquired weapons meant for Kurdish forces.

The above is one of the many US interventions that may play a role in exacerbating the conflict, making Syria and Iraq a heavily militarised zone. It is worth noting that foreign intervention played a role in the rise of Daesh in the first place -- which the US led coalition is now pumping in billions of dollars to combat.

In Iraq, after the US invasion of 2003, a need emerged to replace the security vacuum with a new political elite. The main opposition to Saddam Hussein at the time were ethno-sectarian parties, and the US brought these factions to power cementing identity politics in the region.

Fanar Haddad, of the Middle East Institute in Singapore, points out that the politicians who came to power post 2003, were not politicians who happened to be Shia, but rather, Shia politicians with a fundamentally Shia-centric ideology and political outlook.

Further, post 2003 institutions came to be organised along sectarian lines. For instance, the Iraq Governance Council, which served as the provisional government of Iraq from July 13, 2003 to June 1, 2004 was formed along ethnic lines -- comprising of 13 Shias, five Sunnis, five Kurds, one Turkmen and one Assyrian.

In today’s Iraq, the Prime Minister is a Shia, the speaker of Parliament a Sunni, and the President a Kurd.

This creation of identity-based politics, paved the way for sectarian identity to become a key political factor. Prior to 2003, although a limited notion of a Shia identity and a Kurdish identity did exist in Iraq, there was no concept of a homogenous Sunni identity. The divisive policies of the Iraqi state -- facilitated by the US -- have paved the way for the emergence of a Sunni identity.

It is this emergence of a Sunni identity rooted in the notion of victimhood, that made the emergence of Daesh in Iraq possible. The group has existed under various names, first coming into existence in early 2004 as the Jam??at al-Taw??d wa-al-Jih?d, or "The Organization of Monotheism and Jihad" (JTJ). The founding ideology of the group was based on resistance to American intervention in Iraq, with foreign fighters allegedly playing a key role in the establishment of its network. At this point, the group was led by the late Abu Musab al Zarqawi.

The group soon after swore allegiance to Osama Bin Laden, and changed its name to Tan??m Q??idat al-Jih?d f? Bil?d al-R?fidayn, or "The Organization of Jihad's Base in the Country of the Two Rivers.” At this point, the group came to commonly be known as “Al Qaeda In Iraq” although it never formally went by that name.

In 2006, the group merged with a number of other militant groups, to form the "Mujahideen Shura Council," which later that year, following the death of Zarqawi at the hands of US forces, organised itself into the “Islamic State of Iraq” (ISI) or the Dawlat al-?Iraq al-Isl?m?yah. It was in this year that the group made some key advances, securing the Dora neighbourhood in southern Baghdad.

In 2007, it is estimated that the group killed over 2000 civilians, targeting Shias specifically in its onslaught. In June 2006, ISI killed 13 people at a meeting of Al Anbar tribal leaders in Baghdad, saying that the attack was in response to the rape of a Sunni woman by Iraqi police.

In 2009, the group claimed responsibility for the October Baghdad bombings, in which 155 people were killed, and the December Baghdad bombings, wherein 127 people died. The group followed these attacks with a January 2010 bombing that killed 41 people, an April 2010 bombing that killed 42 people, an August 2010 Baghdad bombing, and a December 2010 Church attack. It continued bombings in 2011 and 2012, during which time it began making inroads into Syria. In June 2013, the group attacked prisons at Abu Ghraib and Taji in Iraq, freeing several hundred prisoners.

In Syria the group began consolidating itself the city and province of Raqqa, expanding into northwest areas of the country. In September 2013, the group overran the Syrian town of Azzaz, with the Syrian Observatory of Human Rights labelling the group as the “strongest group in Northern Syria” by November 2013.

As the group expanded from Iraq into Syria -- establishing a stronghold in Ar-Raqqah province -- it renamed itself the "Islamic State of Iraq and the Levant", or the "Islamic State of Iraq and al-Sham” in 2013, under the supervision of its current leader, Abu Bakr al-Baghdadi, who took over in 2011. The name change was based on the Baghdadi’s intent to merge ISI with the Syria-based Nusra Front. Nusra Front and Al Qaeda leaders immediately rejected the merger.

The group has often been referred to as an Al Qaeda off-shoot, but the exact nature of its relations with the Al Qaeda are not clear. In recent months, both groups have made statements disassociating themselves from the other, with Daesh leader Al-Adnani saying, ““the ISIL is not and has never been an offshoot of Al Qaeda.”

When the group captured Mosul in June last year, the international community was taken by surprise at the strength of a relatively unknown Iraqi group. Daesh’s gains in Iraq are directly linked to its operations in Syria, where it had come to control large swathes of territory in its fight, along with other groups, against Syrian President Bashar-al-Assad.

The advance of anti-government forces in Syria, was made possible in turn, by the United States and allies assistance to Sunni rebels, who share with the US the objective to topple Alawite leader Assad. The US greenlighted Turkish and Saudi aid to anti-Assad rebels, supplied these groups with material and financial assistance, and used the CIA to train rebels at a secret base in Jordan.

This not to suggest that the rebels in Syria present a homogenous group, as there is considerable infighting, with the Daesh militants facing setbacks at the hands of the Islamic Front and the Free Syrian Army, for instance. However, affiliations change rapidly, and the Daesh group -- when it was known as Al Qaeda in Iraq -- had expressed solidarity with the rebels in Syria, following which the US immediately increased aid to anti-Assad forces. The aid began as non-lethal aid, but following a June 2013 White House statement that said there was reason to believe that Assad had been using chemical weapons against rebels, the US decided to extend lethal aid to anti-Assad militias. The total aid given by the US to rebels in Syria, according to USAID figures, amounts to over $1 billion.

For FY2015, the US Congress approved $2.75 billion in funds to finance its role in the Syrian crisis, of which $1.1 billion is marked for humanitarian aid, $1 billion for regional stabilisation and $500 million for DOD-led arming and training of opposition forces.

The United States’ dual policy -- of complicit support and aggressive resistance, simultaneously -- has shaped new West Asia, which in turn, is characterised by the factors that are invoked to explain Daesh’s rise: growing sectarianism, the absence of an Arab governance model, and an emerging security vacuum in the region.