Dutch police were puzzled Friday by a spate of letter bombs sent to seemingly random targets in three of the Netherlands' main cities as it warned the public to be on the lookout.
The latest incident happened early Friday when staff at Amsterdam's Okura hotel alerted police after they received a suspect parcel bearing the hallmarks of a letter bomb.
Explosive experts rushed to the luxury hotel and police later tweeted: "The letter is the same as the other ones."
"The hotel does not have to be evacuated, but the military's explosives clearing team is on the scene."