The body of Yehudit Weiss, a 65-year-old woman who was abducted by Hamas on Oct. 7, was found at a "structure adjacent" to Gaza's Al-Shifa Hospital, the Israeli Defense Forces said in a statement Thursday.

Her body was "extracted" and "transferred to Israeli territory," the IDF said.

"In the structure in which Yehudit was located, military equipment including Kalashnikov rifles and [rocket-propelled grenades] were also found," the IDF said.

"For us, it is too late," Weiss' daughter-in-law told The Times of Israel. "But it is important for us to support all the families of the hostages, and to tell the world -- bring them home now."

The Israel Defense Force's chief of staff, Lt. Gen. Herzi Halevi, claimed his forces are "quite close" to completely destroying Hamas' military system in northern Gaza.

"We will complete it. We have some finishing to do, but we are getting close to it nicely," Halevi told commanders in a video published by the IDF.

Halevi said the IDF will continue its activity in the Gaza Strip and will "kill [Hamas] commanders and operatives and destroy the infrastructure."

Israeli Defense Minister Yoav Gallant said Thursday that "over the last 24 hours we have gained [operational] control of the western area of Gaza City. The next phase has begun -- the forces are acting precisely and decisively."

"The further we take this operation, [the more we] increase the pressure on Hamas and succeed in eliminating their terror infrastructure including headquarters and tunnels, while also taking down [Hamas] leadership and operatives," he added.

Senior Hamas political leader Ismail Haniyeh stressed Thursday that its forces will defeat the Israelis, saying, "Our people and their strong resistance have thwarted the enemy’s goals and plans to displace our people or recover their hostages by force."

The Israel Defense Forces said it's still operating at Gaza's Al-Shifa Hospital, searching the hospital floor-by-floor as doctors and patients remain sheltered inside.

The IDF said during its searches at the hospital forces have found Hamas intelligence material, weapons and information about the hostages.

National Security Council spokesperson John Kirby reiterated that the U.S. is "still convinced of the soundness" of its intelligence that Hamas is using Gaza's Al-Shifa Hospital as a command center.

"We have our own intelligence that convinces us that Hamas was using Al-Shifa as a command-and-control node, and most likely as well as a storage facility," Kirby said. "And they were sheltering themselves in a hospital, using the hospital as a shield against military action and placing the patients and medical staff at a greater risk. We are still convinced of the soundness of that intelligence."

-ABC News' Molly Nagle

Patients and doctors evacuated the Al-Shifa hospital on Saturday, after the Hamas-run Gaza Health Ministry claimed Israel forced them to leave. The IDF released a statement denying it ordered the evacuation, but in a Friday briefing another spokesperson said the IDF was urging anyone left in Al-Shifa hospital to leave and that it hoped it would take place in the "next few hours."

Doctors described their exodus from the hospital to ABC News, with Dr. Ahmed Mokhallalati -- who is still in the hospital -- saying "all critical ICU patients have died. The situation is terrifying."

"Today early in morning people were forcefully evacuated from the hospital, with absolutely no plan of evacuation of the patients and the medical staff. Most of the civilians together with most of the staff left the hospital," Mokhallalati said.

Mokhallalati said there are around 300 patients, who cannot move, and less than 50 medical staff still in the hospital.

"There are still 33 premature babies in the hospital -- one baby died yesterday, and two babies were taken by their parents to evacuate with them. There is only one neonatologist and one nurse with them," he added. The Israelis have provided only three transport incubators for 33 babies. So, if they tell us 'you have to evacuate now,' I have no idea how to evacuate them."

Dr. Adnan Al-Barash, head of the orthopedic department at Al-Shifa Hospital, told ABC News that the "Israeli army forced us to leave the hospital at gunpoint."

"The path for us to walk was set out among the tanks, we had elderly, wounded… The scene was very tragic and sad," Al-Barash said.

"We went out between the tanks, and we could not get the wounded out on the broken roads and we could not move wheelchairs for the wounded," he added.

-ABC News' Dragana Jovanovic and Zoe Magee