Armed robbers on motorbikes hit luxury store in Paris

French police are hunting for armed robbers who hit a jewellery store on one of Paris' poshest streets, and media reports say the target was the exclusive Harry Winston boutique, self-described "jeweller to the stars".

Paris police said the armed robbers arrived and left on motorbikes, firing a shot outside without causing any casualties.

Video broadcast by BFM-TV showed people dressed in black speeding away on two motorbikes.

A store worker who picked up the phone said the jeweller was robbed on Saturday but hung up without giving details or his name.

The luxury boutique was cordoned off as police investigators went in and out on Saturday afternoon.

The Paris prosecutor's office overseeing the investigation gave the robbery location as Avenue Montaigne, where Harry Winston has its dazzling by-appointment store but would not confirm that the jeweller was the target.

Harry Winston did not immediately reply to emailed questions from the Associated Press.

Neither the police nor the prosecutor's office said whether the robbers made off with jewels and, if so, how much they were worth.

This is not the first time the luxury store has been robbed.

Eight people were convicted in 2015 in connection with a spectacular 2008 hold-up in which three cross-dressing gunmen stole about $US92 million ($A137 million) in loot.