Israel-Gaza updates: IDF preparing for 'wide range of offensive plans'

The death toll continues to climb with over 300 people reported dead in Gaza and Israel.

The Palestinian Health Authority said 198 are dead and 1,610 others are injured in Gaza. According to the Israeli Health Ministry over 100 people are dead and over 900 others are injured.

Just before sundown in a western Gaza City, a massive explosion and fireball were reported after Israel warplanes hit a high-rise apartment complex. The Gaza Interior Ministry said the building housed approximately 100 families.

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Palestinian militants infiltrate Israel from Gaza Strip

Israel declares attack a state of "war" as Hamas fires thousands of rockets.

ABCNews.com

U.S. Defense Secretary Lloyd Austin spoke with Israeli Minister of Defense Yoav Gallant on Saturday to convey his condolences.

"Secretary Austin made clear to Minister Gallant his ironclad support for the Israeli Defense Forces and the Israeli people. He reaffirmed that the Department’s commitment to Israel’s security and its absolute right to defend itself from acts of terrorism is unwavering. Secretary Austin has directed his team to ensure that DoD is closely consulting with all of our Allies and partners who share a commitment to peace and oppose terrorism. Secretary Austin will continue to consult with Minister Gallant in the coming days and weeks to ensure that Israel has the support it needs," the Pentagon said in a statement.

-ABC News' Matt Seyler

Police in New York, where there are locations sensitive to both Israeli and Palestinian interests, are adjusting patrols in response to the situation in Israel.

"The NYPD's Counterterrorism and Intelligence Division consistently work at a level of high alert. When events from around the world could possibly affect NYC or we get Intel on a threat to NYC, we always increase our presence around houses of worship and certain areas when these conflicts arise," the NYPD said in a statement.

The Beverly Hills Police Department also said it increased security and patrols around Jewish institutions in the City and continues to work closely with law enforcement partners in the region to ensure public safety.

Law enforcement and Homeland Security officials will be assessing the potential for residual violence in the U.S.

Increased security around Jewish facilities and on university campuses -- particularly where there is a history of confrontational interactions -- is to be expected. Increased attention is expected to be paid to potential cyber threats and online activities intended to inspire violence by Iran, Hezbollah and other extremists threat actors.

-ABC News' Aaron Katersky and Alex Stone

United Airlines, American Airlines and Delta Airlines announced they will suspend operations to Israel Saturday night following unrest in the region. After two departures scheduled for Saturday, United's future operations will be suspended until conditions allow them to resume, the airline said.

"The safety of our customers and crew is our top priority. We are closely monitoring the situation and we are adjusting flight schedules as required," the carrier told ABC News.

American Airlines said it will temporarily suspended operations to and from Tel Aviv and will continue to monitor the situation, adjusting its operations as needed.

"American Airlines has temporarily suspended operations to and from Tel Aviv, Israel (TLV) [Saturday] and [Sunday], and has issued a travel alert providing additional flexibility to customers whose travel plans are affected. We will continue to monitor the situation with safety and security top of mind and will adjust our operation as needed," American Airlines said in a statement.

Delta Air Lines has canceled scheduled flights in and out of Tel Aviv this weekend. The airline said its working to "safely transport Delta people back to the U.S. and will work with the U.S. government as needed to assist with the repatriation of U.S. citizens who want to return home."

-ABC News' Amanda Maile and Sam Sweeney