Monaco authorities say they detain a person as part of an investigation into a blast reported to have occurred this week. According to multiple outlets, the individual is later released. Authorities describe the investigation as ongoing and say they are “very actively” pursuing their probe. The explosion is reported to have wounded a Ukrainian businessman described as having links to Russia. Two other people are also reported to have been injured. Both reports characterize the incident as an active criminal or security investigation, with the detention and subsequent release reflecting that investigators are pursuing leads while continuing to gather information. Details about the suspected person’s identity, the exact circumstances of the explosion, and the official cause of the blast are not provided in the excerpts. The reports indicate that authorities have not concluded their findings and remain focused on determining what happened and who may be responsible.