The Right to a City and Green Action groups say the activists were taken to a police station in an early morning raid Thursday.
Police spokeswoman Aleksandra Ljuba says the protesters were detained because they resisted police action to remove huge containers they placed illegally on a downtown street.
The protesters, who claim that a construction will ruin the historical center of Zagreb, placed the containers earlier this week, preventing further construction work. They also held a protest rally Wednesday, joined by more than 1,000 Zagreb residents.
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Ne damo Varsavsku: http://www.h-alter.org/vijesti/ekologija/ne-damo-varsavsku