Two Israeli missiles landed near Damascus International Airport late Monday, state-run Syrian media have reported without giving further details.
The missiles hit an arms depot belonging to the Lebanese Shiite Movement Hezbollah, the head of the Britain-based Syrian Observatory for Human Rights, Rami Rahman, said early Tuesday.
Syrian opposition sources said the midnight attack targeted an Iranian cargo plane which was landing at Damascus International Airport.
There was no immediate word on casualties.
Damascus residents told dpa they had heard several loud blasts shortly after midnightcoming from near the airport.
Israel has said that it will not tolerate Iran, a key ally of Syrian President Bashar al-Assad, seeking to establish permanent military bases in Syria.
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Syrian state-run news agency SANA, which routinely accuses Israel of helping rebels, said the strikes came as Syrian forces made advances against rebels in the southern province of Daraa.
Israel usually does not comment on the strikes it is alleged to have carried out in Syria.
Syrian and Iranian military facilities in the war-torn country have been hit several times since April.
Iran has vowed retaliation for one alleged Israeli strike on April 30 that killed a number of Iranian personnel.
Iran and their Hezbollah-backed movement have been fighting alongside Syrian government forces since the conflict started in 2011.
(dpa/NAN)