Emergency personnel respond to one of the people hit by a car, at right, during the beginning of the Hikers Parade at the Trail Days festival in Damascus, Va., Saturday, May 18, 2013. Witnesses said the car drove into a crowd at the parade and hurt several people, but the nature of their injuries wasn't immediately known. (AP Photo/Bristol Herald Courier, Earl Neikirk)
Emergency personnel respond to one of the people hit by a car, at right, during the beginning of the Hikers Parade at the Trail Days festival in Damascus, Va., Saturday, May 18, 2013. Witnesses said the car drove into a crowd at the parade and hurt several people, but the nature of their injuries wasn't immediately known. (AP Photo/Bristol Herald Courier, Earl Neikirk)
Hiker "Quinoa" talks about being given credit for saving the lives of Carson Balckburn, Dalton Thomason, and Faith Ritchie after he ran them and others off the road with a water gun during a festival parade in Damascus, Va., Saturday, May 18, 2013. Just as the children ran off the street, a car came down the road and struck several people. (AP Photo/Bristol Herald Courier, Earl Neikirk)
People attend to a victim who was hit by a car during the Hikers Parade at the Trail Days festival in Damascus, Va., Saturday, May 18, 2013. Witnesses said the car drove into a crowd at the parade and hurt several people, but the nature of their injuries wasn't immediately known. (AP Photo/Republican-American, Bill O'Brien)
People attend to a victim who was hit by a car during the Hikers Parade at the Trail Days festival in Damascus, Va., Saturday, May 18, 2013. Witnesses said the car drove into a crowd at the parade and hurt several people, but the nature of their injuries wasn't immediately known. (AP Photo/Republican-American, Bill O'Brien)
DAMASCUS, Va. (AP) ? Witnesses described a frantic scene and close calls after an elderly driver plowed into dozens of hikers marching in a small Virginia mountain town's parade. Investigators were looking into whether the motorist had suffered a medical emergency before the accident.
About 50 to 60 people suffered injuries ranging from critical to superficial, but no fatalities were reported. Three of the worst injured were flown by helicopter to area hospitals. Their conditions weren't immediately available.
Another 12 to 15 victims were taken to hospitals by ambulance and the rest were treated at the scene, where some paramedics and other first-responders were participating in the parade.
It happened around 2:10 p.m. during the Hikers Parade at the Trail Days festival, an annual celebration of the Appalachian Trail in Damascus, near the Tennessee state line about a half-hour drive east of Bristol.
Damascus Police Chief Bill Nunley didn't release the driver's name or age but said he was participating in the parade and he had traversed the Appalachian Trail in the past. Several witnesses described him as an elderly man.
Nunley said the man's 1997 Cadillac was one of the last vehicles in the parade and the driver might have suffered an unspecified medical problem when his car accelerated to about 25 mph and struck the crowd on a two-lane bridge along the town's main road. The driver was among those taken to hospitals.
"It is under investigation and charges may be placed," Nunley said.
Rudolph "Chip" Cenci, 64, of Minoa, N.Y., told The News-Item newspaper in Shamokin, Pa., that he heard people yelling "get out of the way" and turned around to find the car was about to hit him. He jumped onto the hood and held onto the gap at the base of the windshield near the wipers. He said the driver had a blank stare on his face.
"I bet you that man never realized someone was on his hood," Cenci said.
Cenci said he had a bump on his knee but was otherwise OK. He added that his wife, Susan, 63, narrowly missed being hit.
Amanda Puckett, who was watching the parade with her children, ran to the car, where she and others lifted the car off those pinned underneath.
"Everybody just threw our hands up on the car and we just lifted the car up," she said.
Keith Neumann, a hiker from South Carolina, said he was part of the group that scrambled around the car. They pushed the car backward to free a woman trapped underneath and lifted it off the ground to make sure no one else was trapped.
"There's no single heroes. We're talking about a group effort of everybody jumping in," he said.
Nunley cited quick action by police, firefighters, paramedics and hikers to tend to the victims, including a volunteer firefighter who dove into the car to turn off the ignition. The firefighter, whose name wasn't released, suffered minor injuries.
Mayor Jack McCrady had encouraged people to attend the festival on Sunday, its final day.
"In 27 years of this, we've never had anything of this magnitude, and is it our job to make sure it doesn't happen again," he said.
McCrady said a donation fund was being set up to assist the injured, some of whom don't have medical insurance.
"We want to make sure they don't suffer any greater loss than they already have," he said.
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Jeffrey Beall, a US academic librarian who uses his Scholarly Open Access blog to write about publishers' dubious practices, is being threatened with a $1 billion lawsuit by an Indian publishing group. 
According to the Chronicle of Higher Education, Beall on Tuesday received a letter from an IP management firm's lawyer, warning him that he could be imprisoned for up to three years under India's Information Technology Act. 
