BY Bob Kappstatter, Rocco Parascandola and Joe Kemp DAILY NEWS STAFF WRITERS  Originally Published:Thursday, May 5th 2011, 3:24 PM Updated: Friday, May 6th 2011, 11:49 AM  AÂ man holleringÂ "Secret Service! Coming through!" as President Obama's motorcade neared Ground Zero was tackled by police and held at gunpoint, cops and witnesses said.  Cops leaped over barricades near a post office and rushed toward Matt Duhaime, 30, on Church St. at about 2:20 p.m.  "As the motorcade is approaching, he begins to take off his backpack and go into it - and that's when [cops] move in and grabbed him," said NYPD top spokesman Paul Browne.  Witnesses said cops tossed Duhaime, a musician who just moved to Brooklyn from Chicago, to the sidewalk. Another officer pointed a gun at him.  "No guns! No guns!" one of the officers screamed. "We got him!"  Moments before the drama, witnesses said Duhaime was walking his bike, navigating his way through the crowd.  "Secret Service!" he yelled. "Secret Service! Coming through!"  Duhaime said he didn't think anyone would take him seriously. "I was making jokes to get my bike through the crowd," he told the Daily News. "Everyone was laughing."  Browne said police became suspicious of Duhaime when they spotted him fidgeting with his Chicago Cubs baseball cap and reaching into his bag. Officers suddenly tackled Duhaime on the sidewalk.  "They said, 'Get on the ground!'" Duhaime recalled. "They pointed guns at my head. I just did what I was told. I let them handcuff me."  Police released Duhaime - who plays guitar and sings for a band called Moxie Motive - 20 minutes after the incident. A water bottle filled with Coors Light was found in his backpack.  "[The police] did their jobs," Duhaime said. "By no means do I think they did anything wrong."
A Daily News photographer captured this dramatic photo of cops tackling a suspicious man riding his bike on the sidewalk near President Obama's appearance at Ground Zero Thursday.