WASHINGTON, Jan. 19 (CNA) - President-elect Joe Biden on Tuesday (Jan 19) led a national memorial observance on the eve of his inauguration to honour the 400,000 Americans who have died from COVID-19 during the 11 months since the novel coronavirus claimed its first US victim.

The sundown commemoration came just hours before President Donald Trump was due to leave the White House and hand over a country in crisis. The ceremony, spearheaded by Biden and Vice President-elect Kamala Harris from the base of the Lincoln Memorial, marked the federal government's first official nod to the staggering death toll from the pandemic.

"We must remember. It's hard sometimes to remember, but that's how we heal. It's important to do that as a nation," Biden said in brief remarks to kick off a tribute that was to include observances in cities across the country.

As darkness fell over the nation's capital, 400 electric lamps lining the sides of the Reflecting Pool were illuminated to honour the 400,000 lives lost, followed by gospel singer Yolanda Adams' performance of the song Hallelujah, then a moment of silence in memory of the COVID-19 dead.

"Though we may be physically separated, we the American people are united in spirit," Harris said separately.

A hospital nurse from Michigan, Lori Marie Key, sang Amazing Grace before Biden took to the podium. About 6.5km from where Biden appeared, the bells of the National Cathedral were tolled 400 times after he spoke.

The United States surpassed 24 million COVID-19 infections and 400,000 lives lost from the virus on Tuesday, according to a Reuters tally. The country has recorded more than 200,000 new cases and 3,220 deaths on average over the last seven days.

Among the other landmarks participating in the lighting ceremony were the Empire State building in New York City and the Space Needle in Seattle, Biden's inaugural committee said in a statement. The committee also said it was encouraging Americans to light candles in their windows and churches to ring their bells in a show of unity.

Local officials from Miami, Florida, to San Diego, California, said buildings in their cities were expected to be specially illuminated for the occasion.

The Cathedral of St John the Divine in New York City was inviting the public to light a candle on its front steps on Tuesday evening before a solemn bell toll.