But the managing director of the airport Zak Deir said people were worrying unnecessarily.
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The nine fatalities in Deir Ezzor were among 29 deaths in Syria on Saturday, the LCC said.
American aid means winter supplies for more than half a million people in Aleppo, Homs and Deir Ezzor.
The target has been reported to be near the Syrian town of Deir ez-Zor in Syria's eastern dessert.
Deir Mar Musa, or the Monastery of Moses the Abyssinian, is remote.
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The number of Syrian deaths on Thursday rose to 35 people, the LCC said, with many of those deaths in Deir Ezzor, in the east.
Separately, "A colonel in the Syrian army was shot and killed outside his house, in the city of Deir Ezzor, by unknown gunmen, " the observatory said on its Facebook page.
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He singles out Menachem Begin, the late Israeli prime minister, and blames him for the events at Deir Yassin, a Palestinian Arab village where the killings of civilians occurred in 1948.
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After about half an hour's hard climb - though it's the donkeys that have done all the work - we reach the Deir, a truly magnificent facade carved massively into a coffee-coloured cliff face.
"Israel has responded timely and in good faith to the question addressed to it regarding the possible origin on the uranium particles, traced in the site of the nuclear reactor in Deir al-Zour, " Mr Michaeli said.
Officials from the United Nations and the Organization of Islamic Cooperation plan to go on a mission led by the Syrian government to the provinces of Homs, Hama, Tartous, Latakia, Aleppo, Deir Ezzor, Rif Damashq and Daraa to assess humanitarian needs.
Analysts long have said that there could be a turning point in Syria if the unrest that has raged in major provincial cities such as Homs, Hama, Daraa, and Deir Ezzor were to spread to the larger cities of Damascus and Aleppo.
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