US spy agencies were tracking the rise of the novel coronavirus as early as November, weeks before that information was included in President Donald Trump’s daily intelligence briefing, a former US military official told CNN.

While the exact date of the first report remains unclear, sources told CNN that intelligence gathered in November and in the weeks following offered multiple early warnings about the potential severity of the pandemic now surging in the US.

Intelligence is often only elevated to the highest levels of the government once analysts and officials reach a certain threshold of confidence in their assessment. That day came on January 3, the first day the President’s daily briefing included information the US intelligence community had gathered about the contagion in China and the potential it had to spread, including to the US, according to a person briefed on the matter.