Israeli fighter jets struck and destroyed rocket launchers in southern Gaza’s Khan Younis used by the Hamas terror group to attack central Israel on Monday, in the second barrage it fired as Israel marked the one-year anniversary of the October 7 onslaught.

Before striking the rocket launchers, the army ordered civilians to evacuate the area — part of a cycle Gazans have become familiar with, as some of them have been forced to flee from shelter to shelter dozens of times throughout the war.

The Israel Defense Forces said secondary explosions were seen following the strike, indicating that additional weapons were stored in the Khan Younis area from which five rockets were launched. They impacted in Kfar Chabad, where two people were lightly injured, and Holon.

Separately, the IDF said the 215th Artillery Regiment shelled a rocket launcher used to fire five other rockets at Sderot earlier in the day.

In announcing the evacuation order before striking the rocket launchers, the IDF’s Arabic spokesperson said, “Due to Hamas’s terrorist acts, which will be met with extreme force, you must evacuate these areas immediately and move to the humanitarian area.”

Decimated by war and based in an enclave largely reduced to rubble, Hamas managed to fire a handful of rockets into Israel on Monday morning as Israelis began holding commemorative ceremonies for the roughly 1,200 people killed on October 7 and the 97 still in captivity since that attack.

Triggering blaring alarm sirens, Hamas marked the anniversary at 6:30 a.m. — the hour the October 7 onslaught started — with a volley of four rockets at communities adjacent to the southern Gaza Strip. Three of the rockets were shot down by the army, while the fourth fell in open land, the Israel Defense Forces said.

The IDF said that moments before Monday morning’s rocket attack, warplanes struck sites in the Strip where Hamas operatives were preparing to launch a far larger attack on Israel.

Both of Monday’s attacks were claimed by Hamas’s armed wing, which also published a missive marking the first anniversary of what it said was the terror group’s successful penetration of Israeli communities and the killings of soldiers and “settlers,” a word it uses for all Israelis.

Separately on Monday, the IDF called on Palestinians in northern Gaza’s Beit Hanoun, Jabaliya, and Beit Lahiya to evacuate to the Israeli-designated humanitarian zone in the Strip’s south.

On Sunday, the IDF said it was expanding the size of the zone ahead of plans to operate in northern Gaza and evacuate all civilians from there.

“IDF forces are currently operating with great force in the area. For your safety, you must evacuate these areas immediately,” Col. Avichay Adraee, the IDF’s Arabic-language spokesman, said, publishing a map of the zones that were to be evacuated.

He said the Salah a-Din road would be open as a humanitarian corridor between 8 a.m. and 5 p.m. Monday, to allow civilians to flee to southern Gaza.

Tens of thousands of Palestinians are believed by Israel to still be in northern Gaza, among them thousands of terror operatives who survived previous IDF operations that saw Hamas’s battalions in the area dismantled.

The IDF on said Sunday that troops had encircled Jabaliya amid a new ground operation targeting efforts by Hamas to reestablish itself in northern Gaza.

The military said that the 162nd Division’s 401st and 460th armored brigades encircled the city overnight and troops were operating in the area following intelligence on Hamas operatives and infrastructure, alongside efforts by the terror group to regroup there.

Several dozen terror operatives were killed in airstrikes and tank shelling, according to the IDF.

“The operation will continue as long as necessary, while systematically striking and thoroughly destroying the terror infrastructure in the area,” the military said.

Prior to the operation, the 162nd Division was withdrawn from Rafah and the Philadelphi Corridor — the Egypt-Gaza border area — after five months there, and handed over responsibility for the area to the IDF’s Gaza Division, the first time that the regional division was given responsibility over a large portion of the Strip.

The IDF said there was no reduction in forces in the Egypt-Gaza border area.

The operation marked the fourth push into Jabaliya by the IDF since the start of the war a year ago. The most recent round of fighting there in May was described by the IDF and some officers as “intense” and the “most violent” of the war.

Amid the expanded operation, the IDF announced on Sunday that it was preparing to evacuate civilians from the entire north of Gaza, and would increase the size of the Israeli-designated humanitarian zone in the southern Strip.

The zone, where the vast majority of the Gazan population currently resides, is where most humanitarian aid is being delivered. There are also field hospitals there.

The military also said it was opening up two evacuation routes for Palestinians — along the Salah a-Din road and the coastal road. Aid groups have warned against repeated displacement of already severely malnourished Palestinians.

The preparations for the evacuation of the northern part of the coastal enclave came just a day after the IDF called on Palestinian civilians in parts of the central Gaza Strip to move to the humanitarian zones, again squeezing many of the Strip’s two million people into a smaller zone in the south.

The Hamas-run Gaza health ministry says more than 41,000 people in the Strip have been killed or are presumed dead in the fighting there so far, though the toll cannot be verified and does not differentiate between civilians and fighters. Israel says it has killed some 17,000 combatants in battle as of August and another 1,000 terrorists inside Israel on October 7.

Israel has said it seeks to minimize civilian fatalities and stresses that Hamas uses Gaza’s civilians as human shields, fighting from civilian areas including homes, hospitals, schools, and mosques.

Israel’s toll in the ground offensive against Hamas in Gaza and in military operations along the border with the Strip stands at 348.

Agencies contributed to this report.