The White House on Sunday blamed Hezbollah for the rocket strike Saturday on Golan Heights that it said killed children playing soccer.

At least 12 people were killed in the weekend attack in Majdal Shams, a town in the Golan Heights, according to the Israel Defense Forces.

"We have been in continuous discussions with Israeli and Lebanese counterparts since the horrific attack yesterday in northern Israel that killed a number of children playing soccer," White House National Security Council spokesperson Adrienne Watson said in a statement. "This attack was conducted by Lebanese Hezbollah. It was their rocket, and launched from an area they control. It should be universally condemned."

Hezbollah has denied involvement in the rocket attack in Majdal Shams. But the IDF said a Hezbollah rocket was used in the attack, and U.S. Secretary of State Antony Blinken said earlier Sunday that "every indication" points to Hezbollah as responsible for the strike.

-ABC News' Fritz Farrow

Lebanon's flagship air carrier, Middle East Airlines, delayed departures of several inbound flights to Beirut on Sunday, the airline announced.

The decision by Middle East Airlines came after the Israel Defense Forces announced on Sunday that the military struck targets "deep inside" Lebonnon overnight. The IDF attack in Lebanon unfolded a day after a rocket strike killed 12 people in Majdal Shams, a town in Golan Heights.

Hezbollah denied involvement in the rocket attack in Majdal Shams, but IDF officials claim it was a Hezbollah rocket that hit a sports field, and Secretary of State Antony Blinken said that "every indication" points to Hezbollah as being responsible for the strike.

Middle East Airlines said it delayed the departures of six inbound flights to Beruit that would normally land at night. The flights are now scheduled to land during the day on Monday, the airline said.

Meanwhile, Royal Jordanian Airlines also told ABC News it is considering rescheduling a flight from Amman to Beirut to early Monday morning.

-ABC News' Ghazi Balkiz

U.S. Secretary of State Antony Blinken said that "every indication" pointed to Hezbollah as being behind the deadly strike on Saturday in the Israel-occupied Golan Heights.

"There is no justification for terrorism. Period," Blinken said on Sunday in Tokyo. "And every indication is that, indeed the rockets were from, or the rocket was from Hezbollah."

-ABC News' Brittany N. Gaddy

The Israel Defense Forces on Sunday said the military struck Hezbollah targets "deep inside" Lebanon overnight.

The Israeli Air Force targeted "weapons caches and terrorist infrastructure" in about a half-dozen areas in southern Lebanon, the military said in a statement.

The Israeli attack on Hezbollah infrastructure followed a deadly strike within Israel on Saturday. Hezbollah denied responsibility for the attack in Majdal Shams, a town in the Israeli-occupied Golan Heights.

But an Israeli official said the rocket that struck a sports field, killing 12 people and injuring more than a dozen others, had been fired by Hezbollah.

"We know to say that it is a Falaq rocket with a 53 kg warhead. This is a Hezbollah rocket," Lt. Gen. Herzi Halevi, IDF chief of the general staff, said in a statement. "And whoever launches such a rocket into a built-up area wants to kill civilians, wants to kill children."