Police asked residents in a Texas neighborhood where an explosion injured two on Sunday to stay in their homes until 10 a.m. and have cancelled school buses.
The Shin Bet said the man used his consular vehicle as cover to transport the weapons through Israel's tightly secured border with the Gaza Strip.
"We are proud of you," said President Bashar al-Assad, who flashed smiles and stopped for chats with soldiers in eastern Ghouta.
After nearly 14 years as president, and two other stints as the country's prime minister, another six-year term will extend his lock on power to 24 years.
President Donald Trump will announce the plan, which also includes treatment incentives, Monday in New Hampshire.