GAZA CITY, Gaza Strip — The Palestinian Health Ministry says the death toll in Gaza has risen to 12, with 11 Palestinians killed by Israeli army fire along the border with Israel and a farmer killed by pre-dawn tank fire in a separate incident.
In the deadliest day in Gaza since last fall, the ministry added that at least 1,000 Palestinians were injured Friday by tear gas, live rounds and rubber-coated steel pellets fired by Israeli forces.
The clashes erupted as thousands of Palestinians marched toward the border, including some who threw stones, drawing Israeli fire.
The protests had begun as mass sit-ins organized by Gaza's Hamas rulers, but quickly spun out of control.
Israel's military said thousands of Palestinians rolled burning tires and threw stones at forces stationed on the border, and that troops opened fire at the "main instigators."
Palestinian witnesses said hundreds of Palestinians participated in clashes, while thousands more gathered in tent encampments set up in five sites several at a distance of several hundred meters from the border.
Such mass gatherings near the border signal a new tactic by Hamas — and one that might prove more challenging to Israel's military than previous smaller protests.
Military officials have said they will respond harshly to any breaches of the border fence. At the same time, a rising number of casualties will likely stoke more border tensions, a scenario Israel hopes to avoid.
The sit-ins are seen as a new attempt by Hamas to break a crippling, decade-old Gaza border blockade by Israel and Egypt that has made it increasingly difficult for the Islamic militant group to govern.
Other tactics over the years, including Hamas' cross-border wars with Israel and attempts to reconcile with political rival Mahmoud Abbas, the West Bank-based Palestinian president, have failed to end Gaza's isolation.
Hamas spokesman Fawzi Barhoum praised the turnout.
"The large crowds ... reflect the Palestinian people's determination to achieve the right of return and break the siege and no force can stop this right," he said.
Friday's actions are to be the first in a series of protests planned in Gaza in coming weeks. The protests are to culminate on May 15, the 70th anniversary of Israel's creation, with a march through the border fence.
Palestinians commemorate the date as the anniversary of their mass displacement and uprooting during the 1948 Mideast war over Israel's creation. The vast majority of Gaza residents are descendants of Palestinians who fled or were driven from communities in what is now Israel.
Israel's military said ahead of Friday's protests that it doubled its standard troop level along the border, deploying snipers, special forces and paramilitary border police units, which specialize in riot control.
Maj. Gen. Eyal Zamir, commander of the Israeli military's Southern Command, which includes the border, said Friday that "we are identifying attempts to carry out terror attacks under the camouflage of riots."
He urged Gaza residents to stay away from the border, and held Hamas responsible for any violence there.
Previous protests near the border fence in recent months have turned deadly, with Israeli soldiers firing live bullets at Palestinians burning tires, throwing stones or hurling firebombs.
On Friday, mosques across Gaza called on Palestinians to join the protests. Buses took protesters to the border area, including five tent encampments set up from north to south, several hundred meters from the border fence. By noon, thousands had arrived at the encampments.
Ghanem Abdelal, 50, distributed water bottles to family members sitting on a map near one of the tents east of Gaza City. He said he hopes the protest "will bring a breakthrough, an improvement, to our life in Gaza."
Ismail Haniyeh, Hamas' supreme leader, visited the tents, along with Gaza leader Yehiyeh Sinwar.
The Palestinian Health Ministry said five people were killed by Israeli fire in subsequent clashes, including a 16-year-old boy and a 33-year-old man.
Several hours before the confrontations, a Palestinian farmer identified as 27-year-old Amr Samour was killed by an Israeli tank shell in southern Gaza, the Health Ministry said.
Israel said troops had directed tank fire at suspicious figures near the border fence in the area.
Yasser Samour, a relative and fellow farmer, said Amr Samour was harvesting parsley before dawn, in hopes of selling it fresh in the market later in the day.
"I was working on the next field," Yasser Samour said. "We heard shelling landing on the field where Amr works. We ran there and found him hit directly with a shell. We were more than a kilometer away from the border."
Another farmer was wounded in the leg by shrapnel, Samour said.
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