PALESTINIAN armed groups fired salvoes of rockets from Gaza into southern Israel after an Islamic Jihad leader died in Israeli custody following an 87-day hunger strike, the first such death in more than three decades. Khader Adnan, who was awaiting trial, was found unconscious in his cell and taken to a hospital, where he was declared dead after efforts to revive him, Israel's Prisons Service said. Hundreds of people took to the streets in blockaded Gaza and the occupied West Bank to rally in support of Adnan and mourn his death, which Palestinian leaders described as an assassination. In Gaza,…