Israeli military strikes have killed at least 15 Palestinians in the Gaza Strip over the past 24 hours, the enclave's health ministry said on Sunday, as Arab and U.S. mediators work to shore up a fragile ceasefire between Israel and Hamas.

Prime Minister Benjamin Netanyahu said he ordered the strikes because of a lack of progress in talks to extend the ceasefire.

A coalition of immigration, labor and Gaza ceasefire advocates gathered outside City Hall, urging elected officials to take a stronger response to the Trump administration.

The night federal agents arrested Mahmoud Khalil on Columbia University's campus, the Palestinian activist feared he would be immediately deported, according to a sworn declaration included in a new court filing by his attorneys.

Secretary of State Marco Rubio says more student visas and green cards will be revoked as the federal government makes the case to remove Mahmoud Khalil.