An intelligence official says an Israeli airstrike in Syria early Sunday targeted a shipment of Iranian-made missiles ready to be sent to the Hezbollah militant group in Lebanon.
The anonymous intelligence source said, just like an airstrike early Friday, Israel targeted Fatah-110 guided missiles that could be used against Israel.
Hours earlier, Syria's official news agency reported that Israeli missiles had struck a military research facility just north of the capital, Damascus.
The British-based Syrian Observatory for Human Rights also reported large explosions at the facility in Jamraya, just 15 kilometers from the Lebanese border.
Syria says the facility is the same one attacked by Israel in January.
Syrian state television says the attack is an attempt by Israel to raise the morale of what Damascus describes as "terrorists" trying to bring down the Syrian government of Bashar al-Assad.
Israel is also known to have conducted an airstrike in Syria early Friday, although Israel has not officially commented on any attacks in their neighboring country.
On Saturday, U.S. President Barack Obama said in an interview with the Spanish-language network Telemundo that Israel is justified in protecting itself from advanced weapons shipments to terrorist groups like Hezbollah.
He did not directly comment on the reports of an Israeli airstrike. He said he would let Israel "confirm or deny whatever strikes that they have taken."
Hezbollah is allied with Syrian President Bashar al-Assad. The militant group, supported by Iran, waged a brief war with Israel in 2006. This would be the second time Israel has conducted airstrikes against Syria this year. Israel said it attacked a weapons convoy in Syria believed headed for Hezbollah in January.