TAMPA, Fla. (WFLA) — The City of Tampa has postponed a number of pop-up clinics that were offering the one-dose Johnson & Johnson COVID-19 vaccine after the US government recommended a “pause” in its administration.

The sites were supposed to open at the New Tampa Community Center, Lykes Gaslight Square Park and Loretta Ingraham Park on Tuesday and Wednesday.

Officials confirmed the sites will be closed until further notice amid calls for the temporary halt of the vaccine. The Centers for Disease Control and Prevention and the Food and Drug Administration said it was investigating potentially dangerous blood clots in six women who got the vaccine.

It’s unclear if and when the sites in Tampa will reopen.