Suspected letter bombs went off in the mail room of an office building in Amsterdam and at a post-sorting company in the Dutch city of Kerkrade early on Wednesday, police said.
No injuries were reported in either blast, police added.
Dutch police have been investigating a spate of letter bombs since Jan. 3, which they said appeared to have been sent by the same person. Previous targets have included a hotel, a gas station, a garage, a real estate agent and a bill collection service.
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