The United States and Germany on Saturday told their citizens in Afghanistan to avoid traveling to Kabul airport, citing security risks as thousands of desperate people gathered trying to flee almost a week after Taliban Islamists took control.

The Taliban's co-founder, Mullah Baradar, arrived in the Afghan capital for talks with other leaders. The group is trying to hammer out a new government after its forces swept across the country as U.S.-led forces pulled out after two decades, with the Western-backed government and military collapsing.

Crowds have grown at the airport in the heat and dust of the day over the past week, hindering operations as the United States and other nations attempt to evacuate thousands of their diplomats and civilians as well as numerous Afghans. Mothers, fathers and children have pushed up against concrete blast walls in the crush as they seek to get a flight out.