After rescue services made a routine call to the flat of a 55-year-old man on Monday night, they alerted police to the presence of large quantities of suspicious materials.
Police officers who arrived at the scene discovered 60 litres of chemicals, several kilogrammes of home-made explosives, as well as items needed to build bombs and other explosive devices.
Around 50 residents in the neighbourhood were evacuated from their homes for three hours. The authorities allowed them to return at 1:30 am Tuesday after they had removed the dangerous materials.
They arrested a 36-year-old man, who was temporarily living with the older man. He is being investigated for explosives breaking laws.
The police have said they do not believe there is a political motivation to his bomb-making preoccupation.