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.

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.

The ramped up strikes began just hours after the Trump administration brokered the release on Monday of Edan Alexander in direct talks with Hamas.