KHUZAA, Gaza Strip — Thousands of Palestinians, including hundreds of medical workers in white uniforms, took part Saturday in the funeral procession of a colleague who was shot dead by Israeli troops the previous day along the Israel-Gaza border.

Razan Najjar, a 21-year-old volunteer paramedic, was shot as she tried to help evacuate wounded near Israel's perimeter fence with Gaza. She was the second woman among more than 115 Palestinians who have been killed by Israeli army fire since Gaza border protests began in late March.

U.N. officials condemned the killing of Najjar, saying that witness reports indicated she wore clothing that clearly identified her as a health worker.

"The killing of a clearly identified medical staffer by security forces during a demonstration is particularly reprehensible," said Jamie McGoldrick, the local U.N. humanitarian coordinator.

Palestinian mourners carry the body of 21 years old Razan al-Najjar during her funeral after she was shot dead by Israeli soldiers, in Khan Yunis on June 2, 2018. Said Khatib / AFP - Getty Images

After Najjar's funeral, dozens of mourners headed to the fence and started throwing stones at the Israeli soldiers on the other side. The Palestinian Health Ministry said five protesters were wounded by Israeli fire.

Later Saturday, in a development that threatened to collapse an informal cease-fire, the Israeli military said two projectiles were fired from Gaza. One was intercepted by the Iron Dome defense system and the other landed inside Gaza. Earlier this week, Gaza militants fired a large barrage at Israel, which responded with heavy strikes on Gaza installations.

Early Sunday, the Israeli military said fighter jets attacked three Hamas military compounds in response to the rocket fire. It said it struck a total of 10 targets, including weapons manufacturing and storage sites. Militants responded by firing another projectile that was intercepted, the army said.

Meanwhile, in the West Bank, the Israeli military said its troops shot dead a Palestinian who tried to ram a tractor into its forces.

The military said its initial investigation revealed that a 35-year-old Palestinian from a village near Hebron tried to run over an officer with a Bobcat tractor. The attacker then turned around and tried to attack nearby Israeli civilians, the military said.

It said a soldier opened fire, killing the assailant. No Israeli troops were harmed.

Since 2015, Palestinians have killed over 50 Israelis, two visiting Americans and a British tourist in stabbings, shootings and car-ramming attacks. Over 260 Palestinians were killed by Israeli forces in that time. Israel says most were attackers. The attacks have petered off in recent months as the Palestinian focus has shifted toward mass protests at the Gaza border.

On Friday, the Palestinians protested for the 10th week in a row. The military said some hurled grenades and pipe bombs at troops behind the border fence. Some 40 Palestinians were wounded and Najjar was the only one killed.

The Khan Younis hospital said Najjar had a gunshot wound in the chest with an exit wound in the back.

The military said its troops operated "in accordance with standard operating procedures" and that it was investigating the incident.

Israel insists that throughout the weeks-long campaign its troops have fired only at instigators and that Hamas has been cynically using the demonstrations as cover to carry out attacks. But military officials have acknowledged shooting some people by mistake due to the crowded and smoky conditions of the protests.

On Saturday, the military said it thwarted a Palestinian attempt to damage the security fence surrounding Gaza and a group of militants briefly entered Israel before fleeing back into Gaza when Israeli troops opened fire.

Palestinians and human rights groups have accused Israeli forces of using excessive force, and of killing unarmed Palestinians who did not pose an imminent threat both in the West Bank and Gaza.

Najjar's body was wrapped in a Palestinian flag as the funeral procession started from the hospital and passed near her home in Khuzaa, a village near the Khan Younis that is close to the border and has served as one of five protest encampments across Gaza in recent weeks. She was the eldest of six siblings.

Relatives mourn over the deeath of 21 years old Razan al-Najjar during her funeral after she was shot dead by Israeli soldiers, in Khan Yunis on June 2. Mahmud Hams / AFP - Getty Images

"I want the world to hear my voice ... what's my daughter's fault?" asked her mother Sabreen, dressed in black and seated on a mattress in her living room. "She will leave a large emptiness at home."

On May 14, when the protests peaked over the opening of the U.S. embassy in Jerusalem, a 14-year-old girl, Wessal Sheikh Khalil, was the first female protesters to be shot dead. She was among more than 60 people killed that day, the deadliest since a war between Hamas and Israel ended in 2014.

The Gaza protests are being organized by the territory's militant Hamas leadership and are aimed at drawing attention to the decade-long Israeli-Egyptian blockade on the territory. The blockade, meant to weaken Hamas, has caused widespread economic hardship in Gaza. The protesters are also demanding the "right of return" for Palestinian refugees from the 1948 war and their descendants.

Fares al-Kidra, a colleague of Najjar, said they were approaching the fence to evacuate a wounded man and, as they were leaving, three gunshots were heard and Najjar fell to the ground.

Al-Mezan, a Gaza-based rights group, said Najjar was about 328 feet from the fence and wearing a clearly marked paramedic's vest when she was shot.

Social media videos, and one captured by Associated Press footage, showed Najjar and a cohort of medics walking toward the fence and raising their hands to reach a wounded man lying on the ground. Najjar wore a dark blue headscarf and a white coat with the logo of the Palestinian Medical Relief Society, where she volunteered.

Izzat Shatat, 23, a volunteering ambulance worker, said he and Najjar were set to announce their engagement at the end of the holy month of Ramadan. He said he was worried and asked her not to go to the border area Friday but she refused.

"She helped all people. She has never refused to help. She was the first to run toward anybody when he is shot," he said in tears.