TEL AVIV, Israel (AP) -- Israel launched airstrikes on what it said was a Hamas military site in the Gaza Strip early on Tuesday, after incendiary balloons were sent into Israeli territory, the army said. Israeli forces, meanwhile, searched for six Palestinian prisoners who had escaped from a high-security facility in the biggest prison break of its kind in decades.
Fighter jets struck a Hamas rocket manufacturing workshop as well as a Hamas military compound in Khan Yunis, a city in southern Gaza, according to the army statement. The army said the compound houses a cement factory used for building tunnels used for terror attacks "and is purposefully located in a civilian area adjacent to a mosque and a water treatment site."
The strikes came in response to incendiary balloons launched by Hamas into Israeli territory, the army said. The devices were a show of support for the six escapees, which Hamas and other Palestinian militants hailed as a heroic victory.
For Israel, the escape -- through a secret tunnel, likely with outside help -- marks an embarrassing security breach. The massive manhunt through Israel's north and the occupied West Bank continued on Tuesday as Jews celebrated Rosh Hashana, the Jewish new year.
The prisoners appear to have gone into hiding and there was no indication Israeli authorities view them as an immediate threat.
The developments marked an awkward moment for Israel's new coalition government as it seeks to maintain calm after the deadly 11-day war with Hamas in May and amid a surge in coronavirus infections.
Palestinians consider prisoners held by Israel to be heroes of their national cause, and many celebrated the escape on social media. Efforts to capture the six will likely draw attention to the Palestinian Authority's security coordination with Israel, which is deeply unpopular among Palestinians. There was no immediate comment from the PA, but President Mahmoud Abbas' Fatah party praised the escape.
A photo released by the prison service showed a narrow hole in the floor of a cell, and Israeli security forces could be seen examining a similar hole on a stretch of gravel just outside the walls of the prison.
Israeli officials said they have erected roadblocks and are conducting patrols in the area. Israel's Army Radio said 400 prisoners are being moved as a protective measure against any additional escape attempts. The radio said the prisoners escaped through a tunnel from the Gilboa prison, just north of the West Bank, one of Israel's most secure facilities.
It was the biggest Palestinian escape from an Israeli prison since 1987, when six militants from the Islamic Jihad group broke out of a heavily guarded prison in Gaza months before the outbreak of the first intifada, or Palestinian uprising against Israel.
The six who escaped overnight on Sunday are believed to have headed back to their hometown of Jenin, in the occupied West Bank, about 25 kilometers (15 miles) away. The internationally recognized Palestinian Authority wields little control in the town, where militants in recent weeks have clashed with Israeli forces.
The Palestinian Prisoners' Club, which represents both former and current prisoners, identified the men as ranging in age from 26 to 49 years old.
The most well-known among them is Zakaria Zubeidi, 46, who was a prominent leader in the Al-Aqsa Martyrs Brigade, an armed group affiliated with Fatah, during the second intifada from 2000-2005. He was later granted amnesty along with other Fatah-affiliated militants, but was arrested again in 2019 on what Israeli authorities said were new terror suspicions.
As a child, Zubeidi had been part of a children's theater troupe in Jenin established by Arna Mer-Khamis, an Israeli rights activist, that was the subject of a 2004 documentary.
The other five prisoners were members of Islamic Jihad, and the prisoners' group said four were serving life sentences.
Israeli Prime Minister Naftali Bennett called the breakout a "grave incident" that required maximum effort by Israel's various security branches.
The escape poses a dilemma for Abbas, who met with Israeli Defense Minister Benny Gantz a week ago in the first high-level meeting between the two sides in years. The Palestinian president has said he hopes to revive the peace process after more than a decade-long hiatus under former Israeli Prime Minister Benjamin Netanyahu.
But Abbas' Palestinian Authority is deeply unpopular. He canceled the first elections in 15 years in April when it appeared his Fatah party would suffer an embarrassing defeat. The PA was largely sidelined during the Gaza war in May, and it has cracked down on a wave of protests following the death of an activist in its custody in June.
PA security forces coordinate with Israel to target Hamas and other militants that both view as a threat. But any effort to help Israel re-arrest the escaped prisoners risk further undermining the PA in the eyes of Palestinians.