Israel Defense Forces released a statement Friday about the deadly airstrike in Gaza that killed seven World Central Kitchen aid workers on April 1.

The IDF said it misidentified a WCK worker in the convoy as a Hamas gunman.

"After the vehicles left the warehouse where the aid had been unloaded, one of the commanders mistakenly assumed that the gunmen were located inside the accompanying vehicles and that these were Hamas terrorists. The forces did not identify the vehicles in question as being associated with WCK," the IDF said in a statement Friday.

"Following a misidentification by the forces, the forces targeted the three WCK vehicles based on the misclassification of the event and misidentification of the vehicles as having Hamas operatives inside them, with the resulting strike leading to the deaths of seven innocent humanitarian aid workers," the statement continued.

The report said there were three strikes on the convoy. It also said WCK workers hit in the first vehicle were hit again while moving to another vehicle in the convoy.

"The investigation's findings indicate that the incident should not have occurred. Those who approved the strike were convinced that they were targeting armed Hamas operatives and not WCK employees," the IDF said. "The strike on the aid vehicles is a grave mistake stemming from a serious failure due to a mistaken identification, errors in decision-making, and an attack contrary to the Standard Operating Procedures."

It said WCK correctly coordinated its movements with the IDF prior to the night the workers were killed and that there was a "comprehensive plan" in place for the WCK movement on April 1.

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

President Joe Biden called for an immediate cease-fire to get food and aid into Gaza in an interview airing Tuesday night on Univision.

"So I what I'm calling for is for the Israelis to just call for a cease-fire, allow for the next six, eight weeks total access to all food and medicine going into the country," Biden said in the interview with Univision's Enrique Acevedo. "I've spoken with everyone from the Saudis to the Jordanians to the Egyptians. They're prepared to move in. They're prepared to move this food in. And I think there's no excuse to not provide for the medical and the food needs of those people. It should be done now."

Biden did not mention tying the cease-fire to a hostage deal, according to a transcript of the interview, which would be a shift for the administration. ABC News has reached out to the White House for comment.

Last week, officials pushed back on suggestions that they were separating calls for a cease-fire from hostage negotiations in their readout of Biden's call with Israeli Prime Minister Benjamin Netanyahu.

"Our conviction remains that we need to see an immediate cease-fire to enable the release of hostages but also to enable a dramatic surge in humanitarian assistance, as well as obviously better protecting civilians," Secretary of State Antony Blinken said on April 4.

In the Univision interview, Biden also called Netanyahu's approach in Gaza "a mistake" when asked if he believed the prime minister was "more concerned about his political survival than he is in the national interest of his people" as calls for Netanyahu's resignation have increased following the strike that killed seven World Central Kitchen workers.

"Well, I will tell you, I think what he's doing is a mistake. I don't agree with his approach. I think it's outrageous that those four, three vehicles were hit by drones and taken out on a highway where it wasn't like it was along the shore, it wasn't like there was a convoy moving there, etc.," Biden said in the interview.

The hour-long interview, which is airing at 10 p.m. ET, was taped a day before Biden's call with Netanyahu on April 4.

-ABC News' Molly Nagle