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The motivation for the attack was still not known and the investigation has not so far found evidence to classify it as an act of terrorism, another source close to the inquiry said.
Petanque, a typically Gallic pastime played by some 20 million French in which a ball is slowly rolled along the gravelly ground, is ubiquitous in Parisian courtyards in summer months.
Witnesses cited by French media said a group of men playing boules threw heavy metal balls that are used in the popular game at the attacker, with one hitting him on the head and stalling him.
Seven people including two British tourists were wounded Sunday in Paris when attacked by a man armed with a knife and an iron bar, according to police and other sources.
Abdul Hakim A, also 20, was detained Sunday in the eastern city of Strasbourg, where the two men grew up.
France's ethnic Chechens, mindful that many of their youth have fought jihad in Iraq or Syria, sought Monday to reckon with the deadly Islamist knife rampage in Paris by one of their own.
The attack in central Paris on Saturday night by a knifeman, later shot dead by police, left one person dead and four wounded.
The eastern French town where he grew up is home to a large community of refugees from Chechnya who fled the Muslim-dominated Russian republic during two bloody separatist wars.
A knifeman, shouting Allahu akbar, was shot dead by police after he killed one person and injured four, prompting a terror probe.