Several people were injured when protesters hurled petrol bombs and rocks and police responded with bird shot and tear gas, the witness said.
One source told the BBC that police also fired bird-shot and claimed that several people had been wounded.
Riot police fired back with bird-shot and tear gas, the agency reported.
Al-Wefaq, Bahrain's main Shiite opposition party, said the teen was killed when he was hit by bird pellets shot by Bahraini security forces.
There is no ban on meetings taking place, and foxes can be killed by a bird of prey or shot - but only if no more than two dogs are involved.
Borel also won on a sloppy track in 2009 when 50-1 shot Mine That Bird splashed home first.
Taxi driver Derrick Bird is believed to have shot his twin brother first.
Mr Purdham was the ninth person to be shot dead by Bird, 52, who killed 12 and wounded 11 before killing himself.
At 1335 BST, just over three hours after the first 999 call, Bird was discovered dead, shot through the forehead with his rifle.
Derrick Bird is reported to have shot Mrs Jackson in the street, then her husband - who used to work for the ambulance service - when he came looking for her.
After marvelling at the grace of, say, a white pelican gliding after a school of fish, he would take aim with his hunting rifle, using fine shot so that the bird was not blown to pieces in the process.
Last year's flu-shot shortage was scary enough, but now scientists see the specter of a bona fide pandemic if the bird-flu strain known has H5N1 were to mutate into an infection that could spread to people.
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