Channel 7's John Borsa In New York City

May 2, 2011 Updated May 2, 2011 at 8:27 PM EDT

By WKBW News

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May 2, 2011 Updated May 2, 2011 at 8:27 PM EDT

NEW YORK, NY ( WKBW / ABC NEWS.com ) Thousands of jubilant New Yorkers, and people from across the country and even Western New York, flocked to the site of the 9/11 terror attack Sunday night and Monday to celebrate the killing of Osama bin Laden by U.S. troops.

The emotions are bittersweet. Many are remembering loved ones who perished in the attacks, while others simply felt the need to come together as Americans, at the location that has become iconic on the war on terrorism.

Channel 7's John Borsa from "Eyewitness News," with videographer Chris Podosek, are there as well for this historic moment.

John's first LIVE report Monday showed how packed the scene is, with television and media crews in cramped spaces, elbow to elbow with people coming to "Ground Zero."

John's reports from New York City will air on Eyewitness News, and available online at wkbw.com

Western New York native Lew Blevins arrived there Sunday night, shortly after the news broke that Osama bin Laden had been killed by Special Operations forces.

While there, Blevins recorded some of the first images of people singing the national anthem in tribute to those who lost their lives, and the brave men and women who are fighting the war on terrorism. His video aired exclusively on "Eyewitness News This Morning."

ABC NEWS is reporting that Revelers waved American flags, chanted "USA" and sang patriotic songs during the night. Others popped champagne corks, climbed trees, swung from lampposts and street signs in a spontaneous party that started shortly after President Obama announced bin Laden's death before midnight Sunday.

"Tonight is a great night," said Rocco Chierichella, the retired firefighter who famously handed President George W. Bush a bullhorn when he visited the smoldering wreckage of the twin towers nearly 10 years ago.

"People are releasing some of that jubilation," he told ABC News steps from where he told President Bush that he couldn't be heard.

"I can hear them all," Chierichella said of the revelers. "Let's hear it for the U.S. Army. Tonight is for them."

Mayor Michael Bloomberg rallied New Yorkers at a press conference this afternoon.

"Osama bin Laden is dead and lower Manhattan is pulsing with new activity...Osama Bin Laden is dead and New York City's spirit has never been stronger," said Bloomberg.

"It is heartwarming news," said Alice Hoglan, whose son Mark Bingham died on United Flight 93, the plane that crashed into a Pennsylvania field after being hijacked by terrorists. "It is a form of closure to know that Osama bin Laden is facing his God."

Hoglan is also worried about the future.

"I am concerned that his al Qaeda has taken new shape and new form…that's probably the dreadful specter that we will be facing as the American people go forward," she said.

Lee Ielpi, a former New York City firefighter who lost his firefighter son when the Twin Towers fell, thanked the military for some measure of justice, but warned about the mood becoming too celebratory.

"This is one man. The cancer has been eliminated, but there are still people out there who need to be brought to justice," he said. "I do hope that this brings some comfort to not just the families but worldwide, the ones who have lost loved ones to terrorists."

The news of bin Laden's death tears open the wounds for some 9/11 families.

David McCourt once described the pain of losing his 4-year-old daughter, Juliana, and wife, Ruth, on Sept. 11 as paralyzing sadness and anger that prevented him from moving forward. News of the al Qaeda mastermind's death brought memories of their loss flooding back to him.

"Justice had to be served at some point…for those of us who lost so much on 9/11…it was elation and also for me sadness attached to it because it was a reminder of what I lost," he said.

McCourt's daughter and wife were on their way to Disneyland when their flight was hijacked by bin Laden's terrorists and flown into the World Trade Center.

"This morning, here's a reminder and a sadness that comes over you of what you lost. I am at a different place. I can look at my wife and daughter in one sense, a better sense, and just thank God for allowing them to be in my life for that short period of time rather than a 100 percent of that anger. It's difficult and feelings go back and forth," he said.

For Mary Fetchet who lost her son on Sept. 11, 2001, the military success is a measured step in her healing process.

"Disbelief certainly was the first emotion that I felt... comfort, appreciation for President Obama and the military installations that brought Osama bin Laden to justice," Fetchet said.