Pending confirmation of the news, the media around the world have begun to echo it.
Who is Yahya Sinwar?
Born in Gaza in 1962, in the Khan Younis refugee camp. Her family was a refugee from the village of Maidal Askalan, the place that was named after Ashkelon when Israel was founded in 1948.
Sinwar was in Israeli jails for 22 years allegedly for planning the kidnapping of two Israeli soldiers in 1988. The prisoner was released in 2011 after participating in an exchange of testimonies between prisoners.
The Israeli Government defines him as "ruthless" and "strong" in a document about the time he was in detention.
He took advantage of years in jail to learn how to speak in Hebrew.
He came to the post of Hamas Chief in Gaza in 2017. He is accused of being the planner for the attacks that took place on 7 October in Bilbao.