Dozens of Palestinians broke into the Gaza side of the Kerem Shalom border crossing between Israel and the Hamas-run Strip on Friday evening, setting fire to the gas pipeline that supplies fuel to the Strip, the army said.

The Gazans, who did not break through to the Israeli side of the border, trashed their own supply infrastructure, Israeli military officials said.

The incident came amid the protests along the Gaza border, the sixth week of demonstrations, as part of the “March of Return.” At least 431 Palestinians were injured, Gaza officials said, as some 7,000 took part in the demonstrations, flew dozens of kites with petrol bombs into Israel, hurled stones at soldiers and tried to breach the border fence.

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The IDF shared video of the Kerem Shalom incident, during which Palestinians broke into the Palestinian side of the crossing and damaged pipelines carrying gas and oil into Gaza, which already suffers from a large energy shortage.

“This is a cynical act that harms the welfare of Gaza residents and the humanitarian efforts carried out by Israel and many other countries,” the army said.

בשעה זו כמה עשרות מפרי סדר משחיתים ומציתים מוקדים בצדו הפלסטיני של מעבר הסחורות בכרם שלום. הפורעים פוגעים בצינורות הגז ובדלק המועברים מישראל לרצועת עזה ומיועדים לשימוש תושבי רצועת עזה https://t.co/4vqZfrczk1 pic.twitter.com/7p0Lm1ZECZ — צבא ההגנה לישראל (@idfonline) May 4, 2018

Kerem Shalom is the main crossing for goods and humanitarian aid to pass into Strip from Israel.

Elsewhere, there were two mass attempts to damage and breach the security fence around the central Gaza Strip during the protests, the army said.

Israeli soldiers who were called to the scene of those attempts forced back the demonstrators using less-lethal riot dispersal weapons and live fire.

“Two attempts by a group of rioters to damage the fence and cross into Israeli territory from the central [Gaza] Strip were thwarted a short while ago,” the army said on Friday evening.

In total, 431 Palestinians were injured during the protests, including some 70 from live fire, the Hamas-run Gaza healthy ministry said.

There were no Palestinian deaths reported as of Friday evening, unlike in previous weeks. The IDF does not confirm Palestinian casualty figures, but it put the number of protesters at 7,000.

During the Friday demonstrations, two small Israeli army drones crashed in the Gaza Strip. The military said the drones were not being used in an operational capacity before they fell, but were filming the protests. From video footage, at least one of the drones appeared to be a civilian model in use by the Israel Defense Forces.

סרטון של מה שניראה כמו רחפן שנפל בעזה ( חאן יונס)לפי הצילום לא בטוח שהוא צהלי .עד עכשיו 40 פצועים על הגדר.שרפות בכמה מוקדים מטופלות על ידי כיבוי אש וחיילי צהל. Posted by Pub-leak on Friday, 4 May 2018

It was not clear what caused the drones to crash. Palestinians claimed to have downed them.

According to the army, the 7,000 or so demonstrators were spread out among five main locations along the Gaza Strip. The protest began following the mid-afternoon prayers.

Though the first two weeks of demonstrations saw tens of thousands of protesters, the past month has seen far lower levels of participation.

Protesters rolled burning tires toward the Gaza security fence and threw rocks and Molotov cocktails at the Israeli troops on the other side of the border, the army said.

The soldiers responded to the more violent demonstrators with less-lethal riot dispersal weapons, like tear gas, and also with live fire in some cases.

An army spokesperson said soldiers used live rounds against “main instigators” in accordance with its rules of engagement.

According to the Hamas health ministry, 48 Palestinians have been killed since protests and clashes began along the Gaza border on March 30 and hundreds of others have been wounded from gunfire.

Hamas, an Islamist terror group which seeks to destroy Israel, acknowledged that five of its terrorists were among the fatalities after the first Friday demonstration, but has since refrained for acknowledging whether its men are among the dead. Israel has identified other fatalities as members of terrorist groups.

Israel says it only opens fire when necessary to stop infiltrations, damage to the fence and attacks.

Organizers of the protests said part of Friday’s plans included attempting to fly dozens of kites, some carrying firebombs, over the border fence.

A Guy Fawkes mask strapped to his belt and a Palestinian flag around his neck, Abdullah Issa, 22, said they hoped to send dozens of kites with Molotov cocktails over the fence.

“We will put Molotov cocktails on the Israeli farms,” Issa told the AFP news agency.

“They have no solution for the kites.”

According to the IDF, there was only one case of a kite making it over the border.

These kites, dubbed “terror kites” by some in Israel, have posed a significant challenge to Israeli security services.

The fires started by these kites have destroyed some 800 dunam (200 acres) of wheat and barley fields, according to local Israeli farmers, who turned to the Tax Authority for compensation as “victims of terrorist activities.”

The military has yet to devise a comprehensive response to the threat posed by these kites. For now, soldiers track the kites after they cross the border and attempt to extinguish the resulting fires before they spread.

This has not always been successful. On Wednesday, dozens of acres of grassland were burned in the largest fire yet caused by these kites.

The “March of Return” is an eight-week-long set of protests that began on March 30 and is due to continue until at least mid-May. Though they were initially planned as non-violent demonstrations, the protests were apparently coopted by the Hamas terror group, which rules Gaza and whose leaders have said their goal is to erase the border and “liberate Palestine.”

These weekly, sometimes daily, demonstrations have often turned violent, with Palestinians throwing stones and Molotov cocktails at Israeli troops on the other side of the border, who retaliate with live fire and less-lethal riot dispersal weapons like tear gas and rubber bullets.

The military has faced international and domestic criticism over its use of live fire, with the United Nations and European Union calling for an independent investigation rejected by Israel.

Last week, the UN’s special envoy to the region, Nickolay Mladenov, told the UN Security Council that both Israel and Hamas had to do more to prevent the deaths.

“There has also been an increasing number of dangerous incidents at the fence, including the planting of improvised explosive devices — at least one of which has detonated — the throwing of Molotov cocktails, and attempts to breach the fence,” he said.

“Israel must calibrate its use of force and minimize the use of live fire. Lethal force should be used only as a last resort,” he continued. “Hamas and the leaders of the demonstrations must keep protesters away from the Gaza fence and prevent all violent actions and provocations.”

Earlier this week, the IDF defended its rules of engagement in Israel’s High Court of Justice, saying that they were in line with both domestic and international law.

Last Friday, four Palestinians were killed and over 300 hurt during a particularly violent demonstration along the border, which included a large-scale rush of the security fence.

Israel says Hamas uses the marches as cover for terrorist attacks.

“In recent weeks, we’ve once again seen the complexity of the situation, when our forces found themselves facing mass protests that served as cover for terrorist actions, attacks on soldiers, attempts at kidnapping, attacks on military posts, and attempts to infiltrate [Israeli] towns,” IDF chief Lt. Gen. Gadi Eisenkot said Tuesday.

Israel has repeatedly expressed concern over the possibility of a mass breach of the Gaza fence, in which Palestinians would stream across with terrorists among them, wreaking havoc. Hamas leader Yahya Sinwar has vowed in the past that protesters would “breach the borders and pray at Al-Aqsa,” referring to the major Muslim shrine in Jerusalem.

The demonstrations are due to continue until mid-May, which will mark the start of the Muslim holy month of Ramadan, planned move of the United States Embassy from Tel Aviv to Jerusalem and Nakba Day, a commemoration of what Palestinians consider to be the expulsion from their land.

These “March of Return” protests are so named for the “right of return” demanded by Palestinians from Israel, which would allow them to go back to their native towns and cities.

At previous peace talks, the Palestinians have always demanded, along with sovereignty in the West Bank, Gaza, East Jerusalem and the Old City, this “right of return” to Israel for Palestinian refugees who left or were forced out of Israel when it was established. The Palestinians demand this right not only for those of the hundreds of thousands of refugees who are still alive — a figure estimated in the low tens of thousands — but also for their descendants, who number in the millions.

No Israeli government would ever be likely to accept this demand, since it would spell the end of Israel as a Jewish-majority state. Israel’s position is that Palestinian refugees and their descendants would become citizens of a Palestinian state at the culmination of the peace process, just as Jews who fled or were forced out of Middle Eastern countries by hostile governments became citizens of Israel.

Agencies contributed to this report.