Singapore has approved Pfizer-BioNTech's Covid-19 vaccine for pandemic use and expects delivery of the first shots by the end of December, Prime Minister Lee Hsien Loong said.

The city-state of 5.7 million expects to have enough vaccines for everyone by the third quarter of 2021, Lee added, and will make it free for all Singaporeans and long-term residents.

Lee said he and other government officials would be among the early recipients, after healthcare workers, frontline workers, the elderly and the vulnerable.