Secretary of State Antony Blinken said Wednesday that as many as 1,500 Americans may be awaiting evacuation from Afghanistan, a figure that suggests the U.S. may accomplish its highest priority for the Kabul airlift — rescuing U.S. citizens — ahead of President Joe Biden’s Tuesday deadline.

Untold thousands of at-risk Afghans, however, still are struggling to get into the Kabul airport, while many thousands of other Afghans already have been flown to safety in 12 days of round-the-clock flights.

On Wednesday, several of the Americans working phones and pulling strings to get out former Afghan colleagues, women’s advocates, journalists and other vulnerable Afghans said they have seen little concrete U.S. action so far to get those Afghans past Taliban checkpoints and through U.S-controlled airport gates to promised evacuation flights.

“It’s 100% up to the Afghans to take these risks and try to fight their way out,” said Sunil Varghese, policy director with the International Refugee Assistance Project.