The U.S. embassy in Israel earlier said that it is \"closely monitoring\" the security situation.

\"The U.S. Embassy is aware that there have been casualties as a result of these incidents. U.S. citizens are reminded to remain vigilant and take appropriate steps to increase their security awareness as security incidents, including mortar and rocket fire, often take place without warning,\" the embassy said in the statement announcing the security alert.

U.S. Embassy personnel are currently sheltering in place and the ambassador condemned the attack in a message on social media, saying \"I condemn the indiscriminate rocket fire by Hamas terrorists against Israeli civilians. I am in contact with Israeli officials, and fully support Israel's right to defend itself from such terrorist acts.\"

\"The United States unequivocally condemns the unprovoked attacks by Hamas terrorists against Israeli civilians. There is never any justification for terrorism,\" read a statement from National Security Council spokesperson Adrienne Watson, condemning the attacks against Israel. \"We stand firmly with the Government and people of Israel and extend our condolences for the Israeli lives lost in these attacks. National Security Advisor Jake Sullivan has spoken to Israeli National Security Advisor Tzachi Hanegbi and we remain in close contact with our Israeli partners.\"

Secretary of Defense Lloyd Austin in a statement said he is 'closely monitoring\" the situation and said the Department of Defense \"will work to ensure that Israel has what it needs to defend itself and protect civilians from indiscriminate violence and terrorism.\"

A U.S. defense official told ABC News that Austin had a call with his team this morning including U.S. Centcom Commander Gen. Eric Kurilla – Israel falls under Centcom's area of responsibility.

U.S. Secretary of State Anthony Blinken said the U.S. supports Israel's right to defend itself and \"unequivocally condemns the appalling attacks by Hamas terrorists against Israel, including civilians and civilian communities.\"

Palestinian President Mahmoud Abbas says his people have the right to defend themselves against the \"terror of settlers and occupation troops,\" according to Reuters.

Today marks the day that 50 years ago in 1973 when the Yom Kippur War -- or the Arab/Israeli War -- began.

ABC News' Joseph Simonetti contributed to this report.

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