The anti-Israel demonstration outside of Columbia's campus.© Adam Gray for the NYPost Columbia University President Claire Shipman speaking during Columbia's commencement ceremony.© REUTERS ...

The acknowledgment came a day after Shipman was heckled with loud boos and chants of “Free Mahmoud ” during another graduation celebration.

As light rain fell and a damp chill set in, Shipman congratulated 16,000 new graduates as they depart a school that remains in the crosshairs of the Trump administration.

Despite a stern warning from school authorities, a crescendo of boos were heard Wednesday at Columbia University 's campus, as acting President Claire Shipman acknowledged the absence of their ...

Despite a stern warning from school authorities, a crescendo of boos were heard Wednesday at Columbia University 's campus, as acting President Claire Shipman acknowledged the absence of their ...

The acknowledgment came a day after Shipman was heckled with loud boos and chants of “Free Mahmoud ” during another graduation celebration.

Others were seen wearing keffiyeh scarfs, which have become an emblem of Palestinian solidarity. "Many in our community today are mourning the absence of our graduate Mahmoud Khalil,” Shipman said.