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Israeli forces shelled Gaza on Tuesday after rockets from the besieged enclave were fired onto Israeli territory following the death of Palestinian prisoner Khader Adnan on Tuesday.
There were no injuries from the shelling reported.
Khader Adnan, a prominent Palestinian prisoner died on Tuesday in Israeli custody after a nearly-three-month-long hunger strike, authorities said, the first such fatality in more than three decades.
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. He had previously refused the service's medical care, it added. Many have accused Israeli prison authorities of medical neglect of Palestinian detainees.
Since 2011, Adnan had conducted at least three hunger strikes in protest at detentions without charges by Israel. The tactic has been used by other Palestinian prisoners, sometimes en masse, but the last hunger-striker to die was in 1992.
A lawyer for Adnan accused Israel of medical negligence.
"We demanded he be moved into a civilian hospital where he could be properly followed up (on). Unfortunately, such a demand was met by intransigence and rejection by the Israeli prison authorities," lawyer Jamil Al-Khatib told Reuters.
Adnan, 45, was from Jenin in the Israeli-occupied West Bank. Islamic Jihad has a limited West Bank presence, but is the second most powerful armed group in the Hamas-ruled Gaza Strip.
Meanwhile, fierce fighting between rival generals raged on in Sudan Tuesday despite the latest truce, as warnings multiplied of the potential for a "catastrophic" humanitarian crisis with hundreds of thousands of refugees.
The bloodshed has gripped Sudan since 15 April when tensions erupted into armed exchanges between regular army chief Abdel Fattah al-Burhan and his deputy turned rival, Mohamed Hamdan Dagalo, who commands the paramilitary Rapid Support Forces.
At least 528 have been killed and some 4,600 wounded in the violence, according to the health ministry.
The United Nations' refugee agency, UNHCR, said it was bracing for "the possibility that over 800,000 people may flee the fighting in Sudan for neighbouring countries".
Top UN humanitarian official Martin Griffiths arrived in Nairobi on Monday on a mission to find ways to bring relief to the millions of civilians trapped inside Sudan.
"The situation unfolding there (in Sudan) since 15 April is catastrophic," he said on Twitter.
Sudan's turmoil has seen hospitals shelled, humanitarian facilities looted and foreign aid groups forced to suspend most of their operations.