NEW YORK CITY (WABC) -- The NYPD is increasing security at religious and cultural sites across New York City ahead of planned demonstrations marking the two-year anniversary of the Oct. 7 Hamas attacks in Israel.

Multiple protests and memorial events are planned throughout the day.

Across the city, many are remembering the victims who have died and the hostages still in captivity. Only 20 of those hostages are believed to be alive.

At Columbia University, more than 1,200 empty chairs were set up, each displaying a photo of someone killed.

Israel marks 2 years since Oct. 7 attack

Thousands of people converged on southern Israel on Tuesday to mourn the dead as the nation marked two years since Hamas' Oct. 7 attack plunged the region into a devastating war, while Israel and Hamas presse

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