Former US President Jimmy Carter has died aged 100, his foundation has announced

He died on Sunday afternoon at home in Plains, Georgia, his family says - his son calls him "a hero, not only to me but to everyone who believes in peace, human rights, and unselfish love"

US President Joe Biden describes Carter as "a man of principle, faith and humility," while President-elect Donald Trump says Americans owe Carter a "debt of gratitude"

Former president Bill Clinton says Carter "lived to serve others"

Carter served as the 39th president for one term from 1977 until 1981, and was the longest-lived president in US history

Last year he began receiving hospice care at home after suffering health issues, including a melanoma that spread to his liver and brain

While Carter often is remembered fondly, his time in office was not without problems and controversies.

His popularity fell sharply when the US suffered an energy crisis in 1979 and the economy slipped into a recession the following year.

He tried to persuade Americans to accept stringent measures to deal with the energy crisis - including gasoline rationing - but faced bitter opposition in Congress.

Plans to introduce a universal healthcare system also struggled, while unemployment and interest rates soared.

However there were achievements, too.

His Middle East policy began in triumph in 1978, when Egypt formally recognised the state of Israel.