Two men and two women have been arrested in the case in the southern city of Maastricht.
Prosecution spokeswoman Cindy Reijnders said Monday the tip came last week, but there's no indication that any sarin was about to be used in a terror attack.
One suspect was arrested Friday as he was about to start digging in a field near Maastricht. Police dug up 400-square meter (4,300 sq. feet) in the area to a depth of a meter (yard) without finding anything.
Three of the suspects are Dutch citizens and one has Dutch-Turkish joint citizenship. Their names were not released.
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