An explosion in the heart of one of Europe's most tightly secured territories has opened an investigation that now stretches from Monaco to Germany, with a Ukrainian security service named as a possible suspect in an attack Monaco's own prosecutors initially treated as a case of organized crime. Nearly a week after the blast, the central facts are established, but the motive and the identity of who ordered it remain open questions.

It seems highly probable that this attack was a result of settling scores between tightly knit criminal groups vying for influence over illicit resource, Alexander Protsenko said

The attack looks more like a 'warning' than a premeditated murder attempt, the newspaper said