Israel has targeted Hamas leader Mohammed Sinwar in a strike on a hospital in southern Gaza on Tuesday evening, according to a senior Israeli official and two sources familiar with the matter.

Aid groups and U.N. investigations have accused Israel of aiming to destroy Gaza’s health infrastructure. Israel says it is forced to strike hospitals it says are used by Hamas for military purposes.

Israeli military strikes killed at least 60 people in the Gaza Strip on Thursday, medics said, as the United States and Arab mediators pushed for a ceasefire.