Singapore's health ministry has said it is looking into an "unusual surge" in infections after the city-state reported 5,324 new cases of Covid-19, the most since the beginning of the pandemic, Reuters reports.

Singapore has also recorded 10 new deaths from the disease, taking the toll to 349.

"The infection numbers are unusually high today, mostly due to many Covid-positive cases detected by the testing laboratories within a few hours in the afternoon," the ministry of health (MOH) said in a statement.

"MOH is looking into this unusual surge in cases within a relatively short window, and closely monitoring the trends for the next few days."