U.S. Secretary of State Antony Blinken was asked about the announcement from Israeli Prime Minister Benjamin Netanyahu's office's announcement overnight that additional crossings into Gaza would be opened up for aid to enter.

He said the U.S. "welcomed" the development but that "the real test is results, and that's what we're looking to see in the coming days, the coming weeks."

"Is the aid effectively reaching the people who need it throughout Gaza?" he said. "Do we have a much better system for deconfliction and coordination so that the humanitarian workers, the folks who are delivering the aid, can do it safely and securely? All of these things are critical."

Blinken said these aims would be measured by clear metrics "like the number of trucks that are actually getting in on a sustained basis," and the aid making it to those in need through the enclave — "including critically northern Gaza."

He said the administration would be closely watching to see if other measurements were reversed, including "the fact that almost 100% of the population is acutely food insecure" as well as indicators of potential famine.

"So really, the proof is in the results," he said.

ABC News' Shannon Crawford

The partner of one of the seven World Central Kitchen aid workers killed in an Israeli air strike in Gaza this week is pleading for answers into the deadly attack.

"We need some answers," Sandy Leclerc, the partner of Jacob Flickinger, a dual U.S.-Canadian citizen, told ABC News on Thursday in her first television interview since the attack. "We need the truth of what happened because this situation is so unclear."

"Please Mr. Biden, give us the truth of what happened," she asked of President Joe Biden as she spoke with ABC News correspondent Phil Lipof.

Israel has decided to open another border crossing point -- the Erez checkpoint -- to allow humanitarian aid to cross into Gaza, according to an Israeli official.

The decision comes after Israeli Prime Minister Benjamin Netanyahu and U.S. President Joe Biden spoke by phone earlier Thursday.

"This increased aid will prevent a humanitarian crisis and is necessary to ensure the continuation of the fighting and to achieve the goals of the war," the official said in a statement. "In light of this, Israel will allow the temporary delivery of humanitarian aid through Ashdod (port) and the Erez checkpoint and will increase the Jordanian aid coming in through Kerem Shalom."

-ABC News' Dana Savir

The U.S. military's emergency pier system to get humanitarian aid into Gaza is still en route, Pentagon spokesperson Maj. Gen. Pat Ryder told reporters Thursday.

Ryder said that USAID continues to work with organizations to finalize a distribution plan for the aid once it's transferred by the system -- known as JLOTS -- to shore. He also acknowledged that the deadly Israeli strike that killed seven humanitarian aid workers this week "certainly doesn't make that job easier."

He added that it "has not deterred us from continuing to work with groups and NGOs to come up with solutions."

Ryder confirmed that Israel has committed to providing security on shore for the pier and port system.

"I know Israel's investigating in terms of the strike on World Central Kitchen and we trust that Israel will provide the security that we need on the shore," he said.

Ryder said the system is expected to be operational by the end of April or early May.

"We're not changing the mission. We've been tasked to provide a temporary pier. Everything is on track on schedule at this point," he said.

-ABC News' Luis Martinez

Israeli military officials on Sunday said the Iranian attack had been "thwarted" by Israel and its allies, but warned that the threat of further strikes continued.

Most of the more than 300 drones, missiles and other threats Iran launched were intercepted by Israeli and allied defenses before entering Israel, the Israel Defense Forces said.

"99% of the threats launched towards Israeli territory were intercepted -- a very significant strategic achievement," IDF spokesperson Daniel Hagari said.

The military defense was coordinated with a group of international allies, including the United States, United Kingdom and France, Hagari said.

"This partnership has always been robust, but last night it was exceptionally evident," he said.

The attack included at least 170 uncrewed drones, none of which made it into Israeli territory, he said.

About 25 of the 30 cruise missiles launched were intercepted by Israeli fighter jets before entering Israel, Hagari said.

And more than 120 ballistic missiles were launched, with "only a few" striking targets within Israel, he said. Those that made it through struck Nevatim Air Force Base, causing "minor damage to infrastructure," he said. The base remained open, he added.

"However, it is important to say -- the event is not over," Hagari said. "We remain prepared and ready for further developments and threats."

-ABC News' Edward Szekeres and Kevin Shalvey