The Palestinian militant group Hamas has rejected the latest proposal for a ceasefire in Gaza, saying it was biased towards Israel.
The group had been considering a bridging proposal put forward by the United States, Egypt and Qatar after talks between mediators and Israeli officials last week.
Hamas officials did not attend but were briefed on the talks.
Now the group says the proposal includes new conditions put forward by Israel that it cannot accept.
"After being briefed by the mediators about what happened in the last round of talks in Doha, we once again came to the conclusion that (Israeli Prime Minister Benjamin) Netanyahu is still putting obstacles in the way of reaching an agreement and is setting new conditions and demands with the aim of undermining the mediators' efforts and prolonging the war," it said in a statement.
Hamas has always opposed a continuing Israeli presence inside Gaza, ongoing Israeli control of the Egyptian border and will not agree to a ceasefire that is not permanent.
It said the new proposal ignored those key demands.
"He (Netanyahu) also set new conditions in the prisoner exchange file, and backed down from others, which all prevent the completion of the exchange deal," it said.
"We hold Netanyahu fully responsible for the failure of the mediators' efforts, the obstruction of reaching an agreement, and full responsible for the lives of his prisoners, who are exposed to the same danger that our people are exposed to due to his continued aggression and systematic targeting of all aspects of life in the Gaza Strip."
Mr Netanyahu had earlier told an Israeli cabinet meeting Hamas was blocking a deal.
"We are holding very complex negotiations in which the other side is a murderous terrorist organisation that is unbridled and obstinate," he said.
"There are things we can be flexible on and there are things that we cannot be flexible on, which we will insist on. We know how to distinguish between the two very well."
The US Secretary of State Antony Blinken had just arrived in Tel Aviv when Hamas made its announcement.
The US had earlier been talking up prospects of a deal, saying its goal was to have a ceasefire signed by the end of the week.
Hamas is insisting it already agreed to a proposal in July, but blamed Israel for adding new conditions.
The United Nations has urged both parties to agree to a week-long ceasefire to allow for a mass vaccination campaign against polio, a debilitating disease which thrives in poor sanitary conditions and which appears to have returned to Gaza.
The Israeli military said it had already been allowing the World Health Organization to bring polio vaccines into Gaza, and that enough doses to vaccinate more than 1 million children would be arriving in the coming weeks.
But the military has also been issuing more evacuation orders, forcing thousands of people to move again, while Israel continues bomb sites in population centres.
The US had also been hoping a ceasefire deal could prevent Iran and the Lebanese militant group Hezbollah from attacking Israel in retaliation for two recent assassinations in Beirut and Tehran.
Iran had indicated it might withhold its promised "harsh punishment" if Israel agreed to a ceasefire.
