It's looking more and more like it's family-related.
https://nos.nl/artikel/2276577-verdachte-aanslag-utrecht-stond-bij-herhaling-voor-de-rechter.htmlThe NOS reports that Gökmen Tanis has been in contact with police frequently. He has been tried (Important note, it is unclear if he has been convicted for these crimes) for at least the following crimes:
break-in into a truck in 2012
attempted manslaughter in December 2013, when he fired a firearm toward a residential flat
theft from a store in Utrecht in May 2014
spit on and threathened a police officer in October 2014
driving under the influence in November 2014
demolished a window in Oktober 2015, after which he destroyed a police cell
rape in July 2017. The first step in this court case, a pre-trial review, occurred two weeks ago.
The woman claiming he raped her has stated she 'sort of had a relationship with him'. He is also suspected of domestic abuse with her.
A Turkish news agency says that they have spoken to acquaintances of the suspect; they say that the shooting in Utrecht was related to a family incident.
Do note that authorities have not yet excluded a terrorist motive. The heightened terorrism alert level (level 5) will remain active until at least 22:00.