It was a sign of the sudden transformation sweeping Kurdish-run northeast Syria: foreign aid workers and journalists packed this border crossing on Monday, rushing to get out to Iraq.
The exodus was not propelled by the Turkish offensive launched last week. Instead, it was the return of Syria's central government to the region, where Kurdish administrators have had virtual self-rule for years.
The rush to leave reflected the sudden and dramatic nosedive of the aspirations of Syria's Kurdish minority for autonomy.
The Kurdish-led administration itself invited Syrian government troops to the area to defend against the Turkish assault after the U.S. abandoned them and began pulling its soldiers out.
Foreigners who had entered "Rojava" as the Kurds call their region now woke up to uncertainty over who would be in charge. If back with Damascus in control, they would effectively be in the country illegally.
The departing foreigners were the main activity at the Semelka crossing Monday. The truck lane of the usually bustling commercial gateway was empty only a single pick-up with sheep in the back stood in the parking lot. Dozens of Syrians waited to cross into Iraq.
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Though few organizations made official announcements, it appeared almost all foreigners working for aid groups were leaving.
Dozens of foreign journalists covering the offensive also pulled out, fearing getting caught in the government's security web.
The Kurds set up their administration in the northeast after the Syrian government pulled out its troops seven years ago to fight rebels elsewhere at the height of the civil war. When Islamic State militants swarmed their areas, the Kurds allied with the United States to fight them.
With oil resources recaptured from IS, water resources and millions of dollars in foreign aid, the Kurdish-led administration set up functioning institutions and has pushed ahead with reconstruction and development after the devastation of the war on IS. Aid workers, construction firms and contractors were drawn to the area. Even exiled Kurds returned.
But Rojava was never recognized by Damascus or the international community. Its administration of Semelka, the territory's only crossing to the outside world, was informal.
"This is our nightmare scenario," said Made Ferguson, Mercy Corps' deputy country director for Syria, which had to pull its international staff out of northeastern Syria.
"There are tens of thousands of people on the run and we have no way of getting to them. We've had to pull our international staff out of northeast Syria. We just cannot effectively operate with the heavy shelling, roads closing, and the various and constantly changing armed actors in the areas where we are working."
"It is very bad," he said. Expressing his frustration with the abandonment of the Kurds, he said with tears in his eyes: "I cannot find a word ugly enough to describe what the Americans and the Europeans are doing with this war."