Colin Powell, the first Black US secretary of state, a top military officer and a national security adviser, died on Monday at age 84 due to complications from Covid-19. He was fully vaccinated, his family said.

Powell had multiple myeloma, a blood cancer which was in remission, and early-stage Parkinson's disease, said a close friend who asked not to be named. The blood cancer reduces the body's ability to fight infection and puts people at higher risk for a severe case of the virus.

Powell served three Republican presidents in senior posts and ascended to leadership of the US military as it was regaining its vigor after the trauma of the war in Vietnam, where he served two tours as an Army officer.

"We have lost a remarkable and loving husband, father, grandfather and a great American," his family said, thanking the staff of the military hospital near Washington who treated Powell but providing few details about his illness.

He was the top US military officer when American-led forces drove Iraqi troops from Kuwait in 1991 and the chief US diplomat in 2003 when Washington relied on erroneous intelligence about Iraqi weapons of mass destruction to justify its invasion of Iraq.

The son of Jamaican immigrants who rose to the top of the national security establishment, Powell himself acknowledged that his presentation of that spurious US intelligence would stain his record.

In a brief statement on Facebook, the Powell family said he had died on Monday morning from Covid-19, had been fully vaccinated against the disease and thanked the medical staff at the Walter Reed National Military Medical Center who treated him.

White House spokesperson Jen Psaki said hospitalization and death are "extremely rare" among the fully vaccinated and said Powell's death underscored that underlying health issues and other diseases can lead to greater risk from the virus.

“He had two very serious underlying conditions. And unfortunately, (vaccination) didn’t work. God love him,” President Joe Biden told reporters at a White House event on education. He again implored all Americans to get vaccinated.

Biden earlier praised Powell in a statement.

"Colin embodied the highest ideals of both warrior and diplomat," Biden, describing Powell as a "patriot of unmatched honor and dignity" and a man who "could drive his Corvette Stingray like nobody's business."

Former President George W. Bush, a Republican who named Powell as US secretary of state, noted that "many presidents relied on General Powell's counsel and experience."

"He was such a favorite of presidents that he earned the Presidential Medal of Freedom - twice," Bush said, referring to a medal viewed as the US government's highest civilian award.

Iraq wars

Powell served as US national security adviser under Republican President Ronald Reagan from 1987 to 1989. As a four-star Army general, he was chairman of the Joint Chiefs of Staff under Republican President George H.W. Bush during the 1991 Gulf War in which US-led forces expelled Iraqi troops from neighboring Kuwait.

The New York native considered running for president in 1996, but his wife Alma's worries about his safety helped him decide otherwise. In 2008, he broke with his party to endorse Democrat Barack Obama, who became the first Black person elected to the White House.

Illustrating his deep misgivings about the evolution of the Republican Party as it has moved to the right, Powell endorsed Democrats Hillary Clinton in the 2016 presidential election and Biden last year against Donald Trump. Powell called Trump a liar who presented a danger to the United States.

Biden, who painted his 2020 presidential candidacy against Trump as a fight for the United States' soul, thanked Powell for bucking his Republican Party to back him.

"I am forever grateful for his support of my candidacy for president and for our shared battle for the soul of the nation," Biden said.

Powell will forever be associated with his controversial presentation on Feb. 5, 2003, to the UN Security Council, making Bush's case that Iraqi President Saddam Hussein constituted an imminent danger to the world because of the country's stockpiles of chemical and biological weapons.

He admitted later that the presentation was rife with inaccuracies and twisted intelligence provided by others in the Bush administration and represented "a blot" that will "always be a part of my record."

Richard Boucher, one of Powell's closest aides at the State Department, praised him for admitting the mistake.

"The honorable thing is to say 'I made a mistake.' Powell did that. He owned it. He owned his mistakes as much as his incredible successes," Boucher said.