The U.S. is "strengthening" its capabilities in the Middle East by sending an additional guided missile submarine to the region "in light of escalating regional tensions," according to a statement from Pentagon Press Secretary Maj. Gen. Pat Ryder issued on Sunday.

The update comes the same day Secretary of Defense Lloyd J. Austin III spoke with Israeli Minister of Defense Yoav Gallant.

"Secretary Austin reiterated the United States' commitment to take every possible step to defend Israel," according to the statement.

Secretary Austin ordered the USS Abraham Lincoln Carrier Strike Group, equipped with F-35C fighters, to accelerate its transit to the Middle East, which was previously expected to get there by the end of the month.

The Lincoln was already en route to replace the USS Theodore Roosevelt, but will now add to the capabilities of the Roosevelt

Additionally, Austin has ordered the USS Georgia guided missile submarine to the Middle East.

The statement doesn’t say how soon the Lincoln or the USS Georgia will arrive in the region.

-ABC News' Anne Flaherty

The Israel Defense Forces (IDF) intercepted approximately 30 "projectiles" that were identified as crossing from Lebanon into northern Israel early Monday morning local time, the IDF said in a statement.

No injuries were reported from the attacks, the IDF said.

"The IDF is striking the sources of fire," the IDF added.

-ABC News' Dana Savir

Hamas leaders are asking mediators of the cease-fire negotiations with Israel to present a plan based upon previous talks instead of engaging in new ones, according to a statement Sunday.

Hamas also appeared to decline to discuss the "new conditions" proposed to the cease-fire plan by Israeli Prime Minister Benjamin Netanyahu in July, saying Israel then "went on to escalate its aggression against our people and commit more massacres."

The new development in the ongoing cease-fire negotiations came after a diplomatic push from the United States, Egypt and Qatar for a new round of talks to take place between Israel and Hamas on Aug. 15 in either Doha or Cairo. Israel agreed to send a delegation, but Hamas had yet to respond –- until now.

The upcoming talks were widely seen as the last, best possible chance at securing an agreement between the warring parties.

-ABC News' Ghazi Balkiz, Nasser Atta

The Israel Defense Forces on Sunday ordered civilians in the al-Jalaa neighborhood of northern Khan Younis to evacuate as Israeli troops began raiding the area it alleges is being used by Hamas terrorists.

The IDF said the area -- part of a humanitarian zone the Israeli military had initially set up in the southwestern Gaza Strip -- was being exploited by Hamas "for terrorist activity" and is now considered "dangerous." As a result, the IDF said, the boundaries of the humanitarian zone would be adjusted to exclude the al-Jalaa neighborhood.

The move comes just days after the Israeli military launched a fresh assault on Khan Younis, ordering civilians to evacuate the heavily destroyed eastern districts, where many Palestinians had returned less than two weeks ago after the IDF’s last incursion into Gaza’s second-largest city in July, according to the U.N. Relief and Works Agency. The area was also once part of the designated humanitarian zone.

"Due to significant terrorist activity, exploitation of the Humanitarian Area for terrorist activity and rocket fire toward the State of Israel from the al-jalaa area, remaining in this area has become dangerous," the IDF said in a statement Sunday morning. "Accordingly, at this time, the Humanitarian Area will be adjusted. The adjustment is being carried out in accordance with precise intelligence indicating that Hamas has embedded terrorist infrastructure in the area defined as a Humanitarian Area."

The IDF said early warnings to civilians were being made to mitigate harm to the civilian population and keep civilians away from areas of combat.

-ABC News' Morgan Winsor