The United States on Tuesday cast the sole vote against a United Nations Security Council resolution that would have called for an immediate cease-fire in the Gaza Strip, saying it feared it could disrupt hostage negotiations.

It was the third time Washington wielded its veto to block a resolution demanding a stop to fighting in Gaza, underlining America’s isolation in its continued, forceful backing of Israel.

Over four months of war, Israel has come under increasing international pressure over the scope and intensity of its campaign against Hamas in Gaza, with many leaders decrying the high civilian death toll.

Algeria’s U.N. ambassador, Amar Bendjama, lashed out at the United States on Tuesday, telling the Council that the veto “implies an endorsement of the brutal violence and collective punishment inflicted upon” the Palestinians. He said “silence is not a viable option, now is the time for action and the time for truth.”

The diplomatic maneuvering comes at a time when aid organizations are warning that urgent assistance is needed for a population suffering from severe malnutrition and the spread of infectious disease.

Thirteen Security Council members voted in favor of the resolution, which was drafted by Algeria, while Britain abstained.