Claim: 20 hospitals declared a 'black alert' on 11 January.
Fact-check: How many hospital black alerts were there this week? - Full Fact
Verdict: that's according to media reports, which say that 23 hospital trusts in england have reached the highest level on the nhs's system for saying whether they are under pressure, or are otherwise under serious strain. the department of health doesn't use the term 'black alert'.
Organisation: Full Fact
Author: Claire Milne
Date published: 2017-01-13T00:00:00