Israel has indicated it will take more action in retaliation against a deadly strike on a soccer field in the Israel-occupied Golan Heights.

The country claims that Lebanon-based Hezbollah is responsible for Saturday's rocket attack that killed 12 people, including children, and wounded more than 20 others. But the Shia Muslim group denies involvement.

The Israeli military announced on Sunday it struck a series of Hezbollah targets in Lebanon.

Israeli Defense Minister Yoav Gallant said Hezbollah will bear a heavy price for their actions.

US Secretary of State Antony Blinken, who is visiting Japan, told reporters on Sunday that every indication is that the rockets or the rocket was from Hezbollah.

Blinken said: "We stand by Israel's right to defend its citizens from terrorist attacks. But we also don't want to see the conflict escalate." He added that the best way is to get a ceasefire in Gaza.

Meanwhile, Israeli forces continued intense attacks on the Gaza Strip on Sunday. Local media reported that Israeli warplanes bombed tents of displaced citizens in Khan Younis, southern Gaza, killing three people, including a child.

Health officials in Gaza say 39,324 people have been killed since the conflict began last October.