The main suspect in a bomb attack that wounded a Ukrainian tycoon on Monday in Monaco is a Ukrainian woman who disguised herself as a man, local authorities say.

Named as 39-year-old Anastasiia Berezovska in an Interpol Red Notice, she last resided in Germany and has a tattoo, possibly of a snake, running down her right arm from her shoulder to elbow.

After the attack, the suspect fled to neighboring France, then drove to Italy in a German-registered car that had been rented for the operation, prosecutors added.

The sophistication of the bomb used indicates that more than one perpetrator was involved, prosecutors said, adding that two men were arrested in Monaco before being released due to lack of evidence.

The main suspect has been the subject of a manhunt ever since a bomb exploded four days ago in the entranceway of one of Monaco’s fanciest apartment buildings, targeting Ukrainian-born businessman Vadym Yermolaiev, according to CNN’s French affiliate BFMTV.