"We do not know when they will explode".
Qatar has backed Turkey's offensive.
CNN is reporting that shells landed within "several hundred" meters of an American position. "There are no U.S. injuries".
SDF forces currently hold some 12,000 ISIS militants in their prisons following years of helping the U.S.in quashing the group's influence, but now that the US has effectively withdrawn its support and allowed a Turkish incursion into their territory, the Kurdish-led group must focus its efforts on protecting its people and borders, head spokesman Mustafa Bali told Rudaw. The Turkish safe zone plan foresees a 30 km (18 miles) deep zone, and the Turkish Air Force is already conducting precise airstrikes at the limit of the these 30 km (18 miles).
It wants to move in and create a "safe zone", wiping out the Kurds and any ISIS prisoners being kept there.
The SDF lost 11,000 fighters in the US-led campaign.
In a statement late Friday, Turkey's Defense Ministry said it did not open fire at the U.S. facility, and said it struck a Kurdish position after a Turkish position had been attacked with machine guns and mortar fire 1 kilometer (0.6 miles) from a United States observation post.
An Iraqi Kurdish intelligence official confirmed the shelling. Germany earlier announced it was reducing its arms sales to the North Atlantic Treaty Organisation ally.
The foreign ministry said that by accusing Turkey, rather than a "terrorist organisation that threatens the territorial integrity of Syria", the League was betraying the Arab world. However, "instead of returning fire, the Special Forces withdrew once the shelling had ceased".
But the Kurds say the Turkish invasion amounts to an attempt to redraw the ethnic map of the region at their expense.
Another U.S. defense official, also speaking on condition of anonymity because of the sensitivity of the issue, said that the Pentagon "obviously" told Turkey where U.S. troops are and "they certainly go closer than we would have liked" in the incident outside Kobane. There's no other target in the area.
"And they're waiting for just one thing; for us to turn our attention to something else so that they can reorganise themselves and start rebuilding their caliphate. Please help us, please help us, it's enough", Bawan, one of the Kurdish protesters, told Reuters.
"I think President Trump is absolutely right in wanting to bring home USA troops", Aybet told Vittert.
Turkey is fighting them, claiming they are a terrorist organisation.
Turkish-backed Syrian opposition fighters from the Syrian National Army, are driven through the town of Akcakale, Sanliurfa province.
Turkish-backed Syrian rebels have advanced into Ras al Ain in northeast Syria but it was unclear how far, with Turkey saying the town centre had been taken and Kurdish-led forces denying this.
Mnuchin said that Trump had signed an executive order giving Treasury the authority, in consultation with the State Department, to impose sanctions a moment's notice.
Dozens of non-Syrian Kurds also attended the rally outside the White House.