In recent months, eleven suspects have been arrested in connection with the theft of two large batches of iPhones at Schiphol, the Royal Netherlands Marechaussee reported on Monday.
In the thefts, a total of 18.5 million euros in telephones was stolen.
Detectives from the Royal Netherlands Marechaussee started an investigation in March last year into the theft of a load of iPhones worth about 3 million euros.
The investigation team has arrested six suspects in recent months, from Zaandam, Amsterdam, Volendam, Eindhoven and Haarlemmermeer.
The last arrest was last week.
During searches of suspects' houses, EUR 30,000 in cash was found and several phones were seized.
In December last year, another police investigation team started an investigation into the theft of a shipment of iPhones worth 16 million euros.
The mobile phones had been stolen from a warehouse of a company at Schiphol East.
The detectives arrested five suspects from Amsterdam, Purmerend, Kampen, Hoofddorp and Zaandam.
During searches in the municipality of Haarlemmermeer and Germany, a total of 9,200 stolen iPhones were found.
According to the Royal Netherlands Marechaussee, there is a connection between the cases.
Among the suspects are three people who work at the companies from which the goods were taken.
The investigation is still ongoing.