Six-time Paralympic champion David Weir has declared he will never wear a Great Britain vest again after venting his frustration at British Athletics.
The 37-year-old wheelchair racer endured what he described as a "terrible" Paralympics last September in Rio.
Having won four golds at London 2012 four years earlier, he left Brazil without any medals and later said the event would be his final Paralympics.
Weir also said he would finish his career at April's London Marathon, rather than at July's IPC Athletics World Championships at the London Stadium.
In addition, he hinted at behind-the-scenes tensions with the national governing body but refused to discuss them publicly.
On Tuesday morning, however, he took to Twitter to express annoyance at British Athletics without giving his reason.
Weir wrote: "I have been let down again. Today is the day I officially retire from GB I will never put a shirt on again.#thanksBritishAthletics what a joke."
British Athletics have told Sky Sports News HQ they are unaware of the reasons behind Weir’s comments.