JERUSALEM — Hamas militants in the Gaza Strip fired dozens of rockets and mortar shells into southern Israel on Wednesday in the heaviest bombardment on the area in months, drawing ominous Israeli threats of retaliation and dangers of escalation.
The violence came a day after a landmark visit to Gaza by the emir of Qatar. Israeli officials suggested the visit, the first by a head of state to the Hamas-ruled territory, emboldened the militant group.
The rocket fire began shortly after the emir left Gaza late Tuesday and continued through the night. Israeli officials said more than 80 projectiles were fired, and Hamas claimed responsibility for many of the attacks.
Israel responded with a series of airstrikes on rocket launchers, killing two Palestinian militants, according to Gaza medical officials. Two other Palestinians were killed Tuesday.
Three Thai laborers working on an Israeli farm were wounded, two seriously, when a rocket hit a chicken coop. Other rockets badly damaged five houses and broke car windows. Schools in the area were closed.
Many people spent the day indoors, while others stayed in close proximity to the makeshift cement shelters found in the streets of southern Israeli towns. In one farming community, shrapnel covered trees and a children's playhouse in a backyard.
"Sometimes it feels like a scene out of the movie 'Platoon,' something out of the Vietnam war. We can stay at home and just hear the noise of the war," said Tamara Cohen, a resident of the border community of Ein Habesor whose children, ages 9 and 5, spent the night in a fortified "safe room" in their home.
A video issued by Hamas' military wing showed six rockets peeling off in rapid succession, then later, from what appears to be a different location, eight rockets shoot off, leaving plumes of black smoke behind them. Hamas said the video was made earlier in the day, though it provided no proof.
Hamas officials shuttered schools in border areas. Residents said they worried an escalation of fighting would ruin the upcoming Muslim celebration of Eid al-Adha, when Gaza residents feast, visit families, dress their children in new clothes and take them out to play.
Despite the violence, streets in Gaza City were crowded with residents snapping up clothes and food ahead of Friday's start of the holiday. Traffic jams blocked main roads, and prayer leaders chanted songs for the feast.
Israeli leaders threatened tougher action against the rocket fire.
"We didn't ask for this escalation and didn't initiate it," Prime Minister Benjamin Netanyahu said after touring a missile defense battery. "But if it continues, we are prepared to embark on a far more extensive and penetrating operation." The army said the "Iron Dome" defense system intercepted at least eight rockets.
Defense Minister Ehud Barak told Israel Radio that "if we need a ground operation, there will be a ground operation. We will do whatever necessary to stop this wave" of violence.
Israel's U.N. Ambassador, Ron Prosor, wrote to the U.N. Security Council warning members that if they don't condemn the rocket attacks, "there could be tragic consequences" because Hamas and other militants will interpret the silence "as a green light for terror and provocation."