The White House has pledged assistance to Israel in responding to Hamas' attack -- and America has for decades maintained a vast pre-positioned military stockpile inside Israel.

First established in the wake of the Yom Kippur War of 1973, when it took time for the U.S. to send supplies to Israel, the munitions are available in case of emergencies.

It’s possible that Israel will ask the U.S. to tap into this stockpile, which contains weapons systems including tanks and ammunition stored in warehouses.

While not especially well known to the public, the supplies got some exposure earlier this year when the U.S. planned to use them in order to send artillery to Ukraine in responding to Russia's invasion.

-ABC News' Luis Martinez

Israeli rescue service Zaka said at least 260 bodies were removed from the venue of the music festival in southern Israel that came under a Hamas attack.

United Airlines said Sunday its Tel Aviv flights will remain suspended until conditions allow for them to resume.

The airline operated two scheduled flights out of TLV late Saturday and early Sunday.

"The safety of our customers and employees is our top priority," United said.

-ABC News' Amanda Maile

The union representing American Airlines pilots told its members to "cease flight operations to Israel" amid conflict in the region.

The Allied Pilots Association (APA) president, Ed Sicher, told members to refuse assignments into Israel "until we can be reasonably assured of the region's safety and security."

American Airlines told ABC News earlier Sunday it canceled flight AA145 from Ben Gurion International Airport in Tel Aviv to John F. Kennedy International Airport in New York scheduled for Monday. The carrier said it continues to monitor the situation in Israel and will make further adjustments as needed.

American had announced Saturday it was temporarily suspending operations to and from Tel Aviv and would continue to monitor the situation.

-ABC News' Sam Sweeney, Amanda Maile