The suspect reportedly tracked the family toward the steps of the residential building to plant the device before triggering the explosion.
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"Upon seeing them, the suspect stood up, staying a few meters ahead of the victims, and placed an explosive device, which had been taken from her tote bag, on the entrance steps of the residential building where the victims were heading," Raymond added.
The force of the detonation was felt 13 miles away in Nice, France, according to Monaco's public prosecutor Stéphane Thibault.
"Indeed, the relative sophistication of the explosive device and the modus operandi suggest that the person who planted the device did not act alone," Raymond said.
Two men were initially detained for 48 hours for questioning, but police released them after finding no active involvement in the plot.
Meanwhile, German special forces in Hesse searched Berezovska's rented apartment and vehicle on Thursday, securing evidence for Monegasque authorities.
"Evidence has been secured and will be handed over to the Monegasque authorities.
The Hessian security authorities are supporting the Monegasque authorities in their investigations and are in close contact with them," police in the state of Hesse said in a statement.
The suspect remains at large, and the international warrant is active across 196 member countries.
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"The woman being sought is currently on the run. An international arrest warrant has been issued," Hesse police added.
