With the outbreak of war in Israel following a surprise attack by Hamas on Saturday, Atlanta-based Delta Air Lines and other carriers have suspended flights to Israel.

Delta said it “continues to monitor the situation and is making schedule adjustments accordingly.”

The airline has canceled all of its flights to and from Tel Aviv through the end of this month and said affected customers will be notified via the Delta app or the contact information in their reservations. Customers can also call Delta reservations for help.

“Our hearts are with those who are impacted as our people work to find safe alternatives for customers trying to depart TLV,” Delta said in a written statement. The airline said it would continue to explore options for customers to leave Tel Aviv on its partner carriers.

The Federal Aviation Administration over the weekend issued an advisory to carriers planning to fly into Tel Aviv to “exercise caution” due to the conflict, and to review security and threat information.

Airlines globally are also working with governments to repatriate citizens who were in Israel when the Hamas attack began.

The U.S. Embassy in Israel said U.S. citizens in Israel who need assistance should contact the closest U.S. embassy or consulate using a crisis intake form.

It’s not the first time Delta has suspended service to Israel. In 2014, the FAA instituted a temporary ban on flights to Israel after a rocket was fired from the Gaza Strip.

Delta had just relaunched its flights from Atlanta to Tel Aviv this year, and also had flights to Tel Aviv from Boston and New York.