An explosion at a residential building on Rue Révérend Père Louis Frolla in Monaco injured three people early Tuesday, two of whom were seriously injured. The blast occurred shortly before 21:00 local time (19:00 GMT). Minister of State Christophe Mirmand said the device appeared to contain bolts and pellets and that police were treating the incident as a possible attack. A video surveillance system captured a suspect fleeing toward France, and more than 100 police and emergency personnel responded to the scene. Prince Albert II described the incident as a serious crime and said all relevant state services were cooperating with French authorities. The three injured individuals were taken to a hospital in the nearby French city of Nice. Police continue to investigate the cause of the explosion and the identity of the suspect. Officials said they would provide an update on Tuesday local time.