I found a few articles about the syringes:

'Shots of air': Brazilian health workers accused of giving fake COVID vaccinations with empty syringes | National Post

Kroger mistakenly used empty syringes instead of COVID-19 vaccine at Midlothian store

A spokesperson initially told CBS 6 multiple people were mistakenly given a shot of saline instead of a Coronavirus vaccine at the Midlothian location, but now Kroger says that's not the case.
"After a thorough investigation we just received new information that customers were injected with empty syringes and not saline," said a Kroger Mid-Atlantic spokesperson.