Police in Monaco and France are searching for a suspected parcel-bomb attacker after an explosion injures three people in the wealthy principality. The blast occurs Monday evening at an apartment building entrance in Monaco, according to Monaco prosecutors and multiple reports. Monaco chief prosecutor Stéphane Thibault says the suspect fled on foot to France after the attack. Officials have not publicly confirmed the intended target, and outlets report that identification is based on information from sources rather than official statements. Several reports describe the injured man as a Ukrainian-born businessman with ties to Russia. ABC Australia also reports that the presumed target is Vadym Yermolaiev, a permanent resident of Monaco who has acquired Cypriot nationality, though police have not formally identified the target. The injured include the businessman and two other people. Prosecutors say investigations are under way in both jurisdictions as authorities work to locate the suspect and determine the circumstances behind the blast.