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 improvised explosive device containing nuts and bolts went off in the foyer of an apartment block called the Sun's Palace soon after 9.00pm on Monday.

Two of the victims suffered life-threatening injuries, police said. One of the wounded is Ukrainian oligarch Vadym Yermolaiev, a source said.

A Ukrainian oligarch was among three injured in a blast Monaco officials are describing as a terrorist attack.

Explosion at residence near border with France was ‘very likely an attack’, minister says