Suspicion that a Norwegian was involved `` has been strengthened , '' security service says . The Al-Shabaab citizen in question has not been named by authorities . Norway 's security service is investigating in Norway and Kenya . The Norwegian security service , PST , said its investigations in Norway and Kenya were ongoing , and that despite some media outlets reporting a name for the possible Norwegian suspect , it was not ready to confirm his identity . The suspect is believed to have ties to a top Norwegian commander , known as Mohamed Abdikadir Mohamed .
Suspicion that a Norwegian was involved `` has been strengthened , '' security service says . The Al-Shabaab citizen in question has not been named by authorities . Norway 's security service is investigating in Norway and Kenya . The suspect is believed to have ties to a top Norwegian commander , known as Mohamed Abdikadir Mohamed .