GAZA CITY, Gaza Strip (AP) — Large crowds of flag-waving Palestinian protesters marched toward the Gaza border fence with Israel on Friday, some of them throwing stones and drawing Israeli fire that officials said killed at least three people.The Palestinian Health Ministry also said 365 Palestinians were hurt by live fire, rubber-coated steel pellets or tear gas fired by Israeli forces at several locations along the fence, but did not provide the breakdown.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. It said it views with “great severity any breach of Israeli sovereignty or damage to the security fence.”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.Ismail Haniyeh, Hamas’ supreme leader, visited the tents, along with Gaza leader Yehiyeh Sinwar.The Palestinian Health Ministry did not immediately provide details on the three people it said were killed by Israeli fire in subsequent clashes.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.—Associated Press writers Ian Deitch in Jerusalem and Karin Laub in Ramallah, West Bank, contributed to this report.