The ISIL terrorist group had planted hundreds of bombs in the ancient city of Palmyra(Tadmur) ready for explosion, informed sources disclosed. "At least 3,000 explosive devices were installed in Palmyra city,” the Arabic-language media outlets quoted an unnamed informed source as saying. The source said that the ISIL created an almost invisible interconnected network, partially hidden under hard paved roads, which could blow up the entire city. "One of the two independent triggers was manual and can be activated by an ISIL agent. The second one was automatic and was connected to the urban grid to set off series of explosions as soon as the electricity supply returns," the source added. He noted that the Syrian security forces were able to Palmyra, and said, "The army also sent out special interference signals to prevent the ISIL terrorists from setting off the chain reaction. In a relevant development on Friday, the Syrian army discovered a weapons depot left behind by the ISIL terrorists in Palmyra (Tadmur) in Homs province before they fled the ancient city last week. The discovered weapons deport contained a large number of rockets and mortar shells were uncovered by the Syrian Armed Forces inside this weapons depot. The discovery came as the Russian and Syrian demining experts have started clearing the bombs and mines laid by the ISIL terrorists before fleeing Palmyra. Palmyra which was under the ISIL control is an important center for the army's future military operations to win back strategic regions, specially in Deir Ezzur and Raqqa provinces. The importance of Palmyra airport lies in the fact that it is located between al-Tal and al-Hayel mountains and to al-Sukhneh to the North and Quaryatayn to the South. Palmyra military airport is close to Deir Ezzur and Raqqa cities which are high strategic importance. The Syrian army is preparing for taking control of several oilfields in al-Sukhneh. Other army units are moving Southward towards al-Quaryatayn which is an important economic hub because several oil and gas pipelines pass through it. The Syrian army is also planning to prevent the ISIL terrorist group from gaining access to al-Qalamoun mountainous regions in Damascus countryside.