Mohammed Ibrahim's uncle says US official who visited teen reported his health is deteriorating in Israeli detention.
Gaza's Health Ministry says Israeli attacks also wounded 77 people, fuelling panic across the war-ravaged enclave.
The US president says he will address the conflict in Sudan at the request of Saudi Crown Prince Mohammed bin Salman.
Hundreds of millions of people face food shortages as conflict, climate change and economic crises take their toll.
Terms of the US-drafted, 28-point framework to end the war closely track Russian demands, according to news reports.
Terms of the US-drafted, 28-point framework to end the war closely track Russian demands, according to news reports.
At least 25 people were killed and dozens wounded in overnight Russian missile and drone attacks across western Ukraine.
The admission comes as lawyers for former FBI Director James Comey sought to dismiss the criminal charges against him.
US President Donald Trump said his administration is searching for a possible resolution to the war in Sudan.
At least 23 people were killed in Israeli air strikes across Gaza on Wednesday, despite the fragile ceasefire.