An Israel official said the strike targeted a shipment of missiles headed to Hezbollah.

“There was an air strike. The target was not a chemical weapons facility. It was missiles intended for Hezbollah,” the official told Reuters. A U.S. official told Reuters the target was apparently a building.

No sign of a response from Syria.

Heightened tensions in the Middle East generally give a boost to oil but broader markets tend to shrug them off unless a major conflict breaks out.