United Nations Secretary General Antonio Guterres is "shocked" by the reported death of Alexei Navalny, who crusaded against official corruption and staged massive anti-Kremlin protests as President Vladimir Putin’s fiercest foe.

Russia’s prison agency said Navalny died Friday in the Arctic penal colony where he was serving a 19-year sentence. The UN said Guterres expresses his condolences to Mr. Navalny's family, and calls for a "full, credible and transparent investigation into the circumstances of Mr. Navalny's reported death in custody."

Spokesperson Stephane Dujarric said the UN is concerned about intensified airstrikes on Rafah and called for a "consistent and dependable food supply" be allowed to enter Gaza.