Why did the Serum Institute of India stop exporting the COVID-19 vaccines to Afr

The head of the Africa Centers for Disease Control and Prevention warned against a "vaccine war" among nations. He was speaking about reports that the Serum Institute of India is suspending major exports of AstraZeneca COVID-19 vaccine. The reason for the suspension, the reports said, was to meet the rising demand within India. The Serum Institute of India produces the AstraZeneca vaccine that is being sent to Africa through the COVAX program. It’s an international effort to make sure poor countries receive enough vaccines.