Authorities in Assam are probing how the 1,000 doses of the Covid-19 vaccine Covishield were found "frozen" in the vaccine store of the Silchar Medical College and Hospital (SMCH), officials said on Tuesday.

Cachar Deputy Commissioner Keerthi Jalli and state National Health Mission Director Lakshmanan S. have separately ordered probes to identify the reason for the 100 vials of Covishield, containing 1,000 doses, being "frozen".