BERLIN—German police say they have arrested a 37-year-old French citizen wanted by Moroccan authorities in connection with the 2003 bombings in Casablanca that killed 45 people.

A dozen suicide bombers blew themselves up May 16, 2003, in tourist areas of the Moroccan city, killing 33 others.

German Federal Police say the unnamed suspect was arrested Monday at Munich airport while transiting from Paris to Dubai with his family.

Police said in a statement Tuesday that the Moroccan-born man is currently being held in detention awaiting extradition proceedings.