Police investigating an attack on the offices of a Dutch magazine three weeks ago have arrested a second person in Rotterdam.

An anti-tank missile was fired at the Panorama building on Amsterdam’s Teleportboulevard on June 21 in an incident linked to a criminal biker gang. A 41-year-old man who was arrested the following morning was reported to be the president of the Woerden chapter of the Caloh Wagoh Main Triad club.

On Wednesday police confirmed a report on Panorama’s website that a 25-year-old man from Rotterdam had been arrested. Both suspects have been detained in custody.

Police are still investigating the motive for the attack, but it is thought it may be a response to articles in the magazine focusing on the murder of a member of Amsterdam’s underworld who was a member of the gang.

Nobody was injured in the blast and staff are continuing to work in the building.