One person is taken in for questioning regarding drone on Bromma Flygplats (BMA/ESSB) in Sweden (article in Swedish):
Drönare stoppade flygtrafik över Stockholm - DN.SE
The airport was closed for about one hour.
The person questioned by police explained that s/he was collecting information for a company involved in a big motorway building project that is ongoing in Stockholm. Apparently they had no clue that drones are subject to legislation.
The explanation is to my knowledge neither confirmed nor denied.