LONDON (AP) — The longest scheduled strike in the history of Britain's state-funded National Health Service entered its second of six planned days Thursday with doctors in England at loggerheads with hospitals over requests for some to leave the picket line to cover urgent needs during one of the busiest times of year.

The strike is the ninth organized by of their careers in just over a year amid an increasingly bitter pay dispute with the British government. Junior doctors form the backbone of hospital and clinic care in England, and plans were laid out before this week's walkout for them to return to work if hospitals got overwhelmed.

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