Tens thousands of Syrians remain trapped on the Jordan border with food, water and medicine running at critically low levels.
Minister of Economic Cooperation and Development Gerd Mueller urged more countries to step up to help millions of Syrian refugees. He says "this appeal is especially directed at the Arab world, countries like Qatar".
Mueller spoke during a tour of German-funded projects for refugees in Jordan. Some 5 million Syrians have fled the civil war since 2011, most settling in Jordan, Turkey and Lebanon.
In June, Jordan sealed its border with Syria after a car bombing on the country's northern border. It left thousands of Syrians without regular access to food, water and medicine.