UK alert level raised to four due to Omicron spread

A new target has been set to give boosters to all adults who want one by the end of the month, he said.

The UK's coronavirus alert level has been raised from three to four due to the rapid spread of Omicron.

Level four means a high or rising level of transmission, and pressure on healthcare services is rising.

"No one should be in any doubt, there is a tidal wave of Omicron coming," British Prime Minister Boris Johnson said in a TV statement on Sunday evening.

A new target has been set to give boosters to all adults who want one by the end of the month, he said.