NEW YORK (CBSNewYork/AP) — Hillary Clinton and Donald Trump are attending the Sept. 11 remembrance ceremony in New York.

The presidential candidates greeted supporters on Sunday as they entered the downtown Manhattan memorial. They’re not expected to make public remarks at the event, and both have promised to suspend campaign activities to mark the 15th anniversary of the attacks.

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Clinton — a former New York senator — has frequently highlighted her efforts, including in a campaign ad released Friday, to aid those affected by the World Trade Center collapse.

“We’ll never forget the horror of September 11, 2001,” Clinton tweeted Sunday. “Today, let’s honor the lives and tremendous spirit of the victims and responders.”

Trump — a New York real estate mogul — has said he donated construction equipment to the recovery effort and gave $100,000 to the memorial after touring it for the first time earlier this year.

“Today is a day of sadness and remembrance. It is also a day of resolve,” Trump said in a statement posted on his Facebook page. Our solemn duty on behalf of all those who perished that September day 15 years ago, is to work together as one nation to keep all of our people safe from an enemy that seeks nothing less than to destroy our way of life.

Obama observed the somber anniversary with a moment of silence in the White House residence at 8:46 a.m. That’s when the first of four hijacked airplanes slammed into the north tower of New York City’s World Trade Center on Sept. 11, 2001.

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Sunday’s ceremony in New York City began with a moment of silence and tolling bells at 8:46 a.m.

After the silent period, victims’ relatives began reading the names of the nearly 3,000 people killed when four hijacked aircraft hit the trade center, the Pentagon and a Pennsylvania field. It was the deadliest terror attack on American soil.

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