The bride was killed when gunmen attacked a wedding party in the tiny village of Goult early Sunday, with one of the assailants also dying during the assault.
The violence might be linked to possible drug-related score-settling, according to sources.
According to another source close to the case, the two men, aged between 20 and 30, have been taken into custody on Sunday, several hours after the attack.
Authorities mobilised dozens of police and a helicopter to hunt down the gunmen.
According to one of the sources close to the case, the groom was known to police for drug and organised crime offences.
Avignon prosecutor Florence Galtier said on Sunday that the assailant was targeted in an apparent exchange of fire. She did not provide further details.
The autopsies were set to be performed this week.
The attackers, who arrived by car, carried several weapons.
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