One of the three Al Jazeera journalists who had been held in Egypt for 400 days has been freed, sources reported Sunday.

Peter Greste, an Australian national, has reportedly boarded an Egypt Air flight and is being accompanied by his brother. However, Greste’s colleagues, Canadian-Egyptian Mohamed Fahmy and Egyptian Baher Mohamed, remain imprisoned for allegedly colluding with the outlawed Muslim Brotherhood in a case that has sparked international condemnation.

A recent presidential decree in Egypt stated that imprisoned foreign nationals may be deported to complete their sentence in their home country, which observers note is likely the reason behind Greste’s release.

Though the news of Greste’s deportation was widely celebrated, many connected to the case demanded the release of Fahmy and Mohamed, in addition to the numerous other wrongly convicted journalists currently detained as part of a sweeping crackdown against dissent in Egypt.

Al Jazeera Media Network released a statement saying that its campaign to free the journalists in Egypt will not end till all three have been released.

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“We’re pleased for Peter and his family that they are to be reunited. It has been an incredible and unjustifiable ordeal for them, and they have coped with incredible dignity,” said Mostefa Souag, acting Director General of Al Jazeera Media Network. However, Souag added: “We will not rest until Baher and Mohamed also regain their freedom. The Egyptian authorities have it in their power to finish this properly today, and that is exactly what they must do.”

Al Anstey, managing director of Al Jazeera English, said he was relieved Greste was freed and on his way home to be reunited with his family, but also spoke of the need to free Baher and Mohamed.