Police arrested a 31-year-old Rotterdam man who they suspect of co-perpetrating theΒ assassination of criminal defense attorney Derk WiersumΒ last September. The man was arrested in Amsterdam on Monday, and remanded into custody by a magistrate on Thursday, police said.
A tactical team was used to make the arrest, before detectives carried out a search of two locations, one in Amsterdam and one in Rotterdam. The magistrate in the case oversaw both searches, a common practice in ongoing investigations.
Markus Jansen 
Agnita Meijer