JERUSALEM (AP) — Under heavy U.S. pressure, Israel has promised to ramp up aid to Gaza dramatically, saying last week it would open another cargo crossing and surge more trucks than ever before into the besieged enclave.

But days later, there are few signs of those promises materializing and international officials say starvation is widespread in hard-hit northern Gaza.

Samantha Power, administrator of the U.S. Agency for International Development, said this week she accepted “credible” reports that famine is now occurring in the area and urged Israel to take further steps to expedite humanitarian aid shipments.

Power’s remarks echoed those of U.S. President Joe Biden, who said on Wednesday that Israeli efforts to increase aid were “not enough.”