They weren't already? https://t.co/7kdedr2SRM

U.S. policy is still "to get all Iranian forces out of Syria," top U.S. Syria envoy Amb. Jim Jeffrey says at Aspen. It's also enduring defeat of ISIS and to get Assad regime to change its behavior — but, he says, "this isn't regime change."

The U.S. is still trying to work out this "safe zone" with Turkey, Jeffrey says, which would lead to Turkish forces pulling back from the border. How's it going, @joshrogin asks? "It's going," Jeffrey says, to laughter.

"To know who rules over you, simply find out who you are not allowed to criticise." https://t.co/fua2wSVslY

NEW: CBS News has captured exclusive footage of U.S. troops inside Saudi Arabia, gearing up for a potential conflict with Iran. On Friday, Iran seized 2 British tankers in the Strait of Hormuz, later releasing one. @CBSDavidMartin is in the Middle East h…

#SOHR Large military mobilizations of the #Turkish forces and their loyal factions arrive in the outskirts of #Manbij in conjunction with mobilizations by the #SDF in the areas of #Tal_Abyad and #Manbij https://t.co/eNPFF19xwQ

#UPDATE: UK Foreign Minister: We will respond to the Iranian actions in a thoughtful but strong/powerful way https://t.co/KImJJJLsor

#TankerTussle in the Hormuz #OOTT https://t.co/9DSsZHs7WU

Exclusive images from @CBSNews show newly deployed patriot missile systems on alert near the Persian Gulf in Saudi Arabia.

Our White Helmets teams are present in the field, working to inspect and secure places, and to assist the wounded. What they cannot do is stop these horrific raids and attacks.

Something is happening up in dier al-zur Not sure what

It's nothing, just sudden orders for some unit sorry for the false alarm https://t.co/DcMXnFbNrr

This ---> https://t.co/HnTYfjyFIj

#UPDATE: UK Foreign Minister: We will respond to the Iranian actions in a thoughtful but strong/powerful way https://t.co/KImJJJLsor

.@CENTCOM: “In coordination with & at the invitation of the Kingdom of Saudi Arabia, the Secretary of Defense has authorized the movement of US personnel and resources to deploy to Saudi Arabia. This movement of forces provides an additional deterrent & ensures…

“defend our forces & interests in the region from emergent, credible threats. This movement creates improvement of operational depth & logistical networks. US Central Command continually assesses force posture in the region” https://t.co/QBAE7PryaW

#FLASH: U.S. Central Command is developing a multinational maritime effort, Operation Sentinel, to increase surveillance of and security in key waterways in the Middle East to ensure freedom of navigation in light of recent events in the Arabian Gulf region…

Pentagon: Deploying additional forces in Saudi Arabia provides additional deterrence against forces in the region while also enhancing our ability to protect regional interests. https://t.co/PNrVGlw27J

Who says journalists can't be an agent of positive change? https://t.co/Sa88MBu8pL

#OperationSentinel "to promote maritime stability, ensure safe passage, and de-escalate tensions in international waters throughout the Arabian Gulf, Strait of Hormuz, the Bab el-Mandeb Strait (BAM) and the Gulf of Oman," according to @CENTCOM. https://t.co/0eaS7XUE8E

BREAKING: Britain advises all UK shipping to stay away from Strait of Hormuz for an "interim period". UK also says its response to seizure of British-flagged tanker by Iran will be "considered and robust". There will be "serious consequences" if situation…