Hamas militants fired thousands of rockets and sent dozens of fighters into Israeli towns near the Gaza Strip in an unprecedented surprise early morning attack during a major Jewish holiday Saturday, killing dozens and stunning the country. Israel said it is now at war with Hamas and launched airstrikes in Gaza, vowing to inflict an “unprecedented price.”

Hours after the incursion began, Israeli troops were still fighting Hamas gunmen in 22 locations near the Gaza Strip, including towns and other communities, army spokesman Daniel Hagari said — a startling sign of the breadth of the assault.

Israel’s national rescue service said at least 100 people were killed and hundreds wounded, making it the deadliest attack in Israel in years. An unknown number of Israeli soldiers and civilians were also taken captive and brought into Gaza, an enormously sensitive issue for Israel. Hagari said militants were also holding hostages in standoffs in two towns, Beeri and Ofakim, which is 15 miles (24 kilometers) from the Gaza border.