Word that COVID-19 vaccination slots were available for all adults at the huge California State University, Los Angeles, site drew a quick response Thursday.

KTLA-TV reported people were being turned away by late morning.

The Cal State LA site was established by the Federal Emergency Management Agency and California’s Office of Emergency Services but will be turned over to the city of Los Angeles next week.

“We’re light on appointments for the next several days. We want to finish strong and use up every dose we have,” Cal OES spokesman Greg Renick told the Los Angeles Daily News on Wednesday.

Cal OES spokesman Brian Ferguson said in an email to The Associated Press on Thursday that advance registration through the state’s MyTurn system is the only way to guarantee a vaccination.

“To the extent to which those appointments go unfilled, there may be a limited number of appointments available as walk ups for individuals 18+ between tomorrow and continuing through Sunday when management of the site transfers to the city,” he said.

The Cal State LA site and another in Oakland were announced as pilot projects by the Biden administration in February.

Cal OES said that as of Monday the sites had administered nearly 625,000 vaccines, including thousands delivered to communities by mobile clinics.