According to the Syrian Observatory for Human Rights, a large explosion has hit near Damascus International Airport. Syrian state TV said an Israeli airstrike targeting a Hezbollah arms depot caused the blast.
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The Syrian Observatory for Human Rights said on Thursday that a large explosion rocked the Syrian capital early in the morning and that fire was now burning near the airport.
No casualties have been reported.
"The blast was huge and could be heard in Damascus," said the head of the Syrian Observatory for Human Rights, Rami Abdel Rahman, according to the AFP news agency.
A Lebanese TV channel, al-Manar, said the blast was "probably" caused by an Israeli airstrike.
Al-Manar is affiliated with Hezbollah, an ally of the Syrian government. Syrian state television also reported that Israel had conducted a missile attack on the site.
An anonymous regional intelligence source speaking to Reuters said the blast site contained a weapons depot operated by Hezbollah, which was regularly stocked with supplies sent from Tehran. Iran is also an ally of the Syrian government.
Who's fighting in the Syria conflict?
Syria's civil war erupted out of the Arab Spring protests that swept much of the Middle East and North Africa in 2011. The conflict has since drawn in multiple warring factions from around the world.
Image: Atta Kenare/AFP/Getty Images
War with no end
Syria has been engulfed in a devastating civil war since 2011 after Syrian President Bashar Assad lost control over large parts of the country to multiple revolutionary groups. The conflict has since drawn in foreign powers and brought misery and death to Syrians.
Image: picture alliance/abaca/A. Al-Bushy
The dictator
Syria's army, officially known as the Syrian Arab Army (SAA), is loyal to Syrian President Bashar al-Assad and is fighting to restore the president's rule over the entire country. The SAA has been fighting alongside a number of pro-Assad militias such as the National Defense Force and has cooperated with military advisors from Russia and Iran, which back Assad.
Turkey, which is also part of the US-led coalition against IS, has actively supported rebels opposed to Assad. It has a tense relationship with its American allies over US cooperation with Kurdish fighters, who Ankara says are linked to the Kurdistan Workers' Party (PKK) fighting in Turkey. Turkey has launched multiple military offensives targeting Kurdish militias.
Image: picture-alliance/AP Photo/L. Pitarakis
The eastern guardian
The Kremlin has proven to be a powerful friend to Assad. Russian air power and ground troops officially joined the fight in September 2015 after years of supplying the Syrian army. Moscow has come under fire from the international community for the high number of civilian casualties during its airstrikes. However, Russia's intervention turned the tide in war in favor of Assad.
Image: picture-alliance/dpa/Tass/M. Metzel
The western allies
A US-led coalition of more than 50 countries, including Germany, began targeting IS and other terrorist targets with airstrikes in late 2014. The anti-IS coalition has dealt major setbacks to the militant group. The US has more than a thousand special forces in the country backing the Syrian Democratic Forces.
Image: picture alliance/AP Photo/A.Brandon
The rebels
The Free Syrian Army grew out of protests against the Assad regime that eventually turned violent. Along with other non-jihadist rebel groups, it seeks the ouster of President Assad and democratic elections. After suffering a number of defeats, many of its members defected to hardline militant groups. It garnered some support from the US and Turkey, but its strength has been greatly diminished.
Image: Reuters
The resistance
Fighting between Syrian Kurds and Islamists has become its own conflict. The US-led coalition against the "Islamic State" has backed the Syrian Democratic Forces, an alliance of Kurdish and Arab militias. The Kurdish YPG militia is the main component of the SDF. The Kurds have had a tacit understanding with Assad.
Image: Getty Images/A. Sik
The new jihadists
"Islamic State" (IS) took advantage of regional chaos to capture vast swathes of territory in Iraq and Syria in 2014. Seeking to establish its own "caliphate," IS has become infamous for its fundamentalist brand of Islam and its mass atrocities. IS is on the brink of defeat after the US and Russia led separate military campaigns against the militant group.
Image: picture alliance/AP Photo
The old jihadists
IS is not the only terrorist group that has ravaged Syria. A number of jihadist militant groups are fighting in the conflict, warring against various rebel factions and the Assad regime. One of the main jihadist factions is Hay'at Tahrir al-Sham, which controls most of Idlib province and has ties with al-Qaeda.
Image: picture-alliance/AP Photo/Nusra Front on Twitter
The Persian shadow
Iran has supported Syria, its only Arab ally, for decades. Eager to maintain its ally, Tehran has provided Damascus with strategic assistance, military training and ground troops when the conflict emerged in 2011. The Iran-backed Lebanese Shiite militant group Hezbollah also supports the Assad regime, fighting alongside Iranian forces and paramilitary groups in the country.
Image: Atta Kenare/AFP/Getty Images
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Israel has refused to confirm or deny that it was responsible for the blast, but Israeli Intelligence Minister Yisrael Katz said such a strike would be in line with Israeli policy.
"We are acting to prevent the transfer of sophisticated weapons from Syria to Hezbollah in Lebanon by Iran," Katz said on Israeli army radio. "When we receive serious information about the intention to transfer weapons to Hezbollah, we will act. This incident is totally consistent with this policy."
Israel has carried out similar attacks in the past.
Damascus has been largely spared from the violence that has occurred regularly in other parts of the country since Syria's civil war began in 2011, but clashes between government forces and rebel troops have come closer to the capital in recent months.