Iran police say people involved in water fights in public places will be charged.
Hundreds of young men and women have been spraying each other with water guns in a number of cities recently, the BBC reports.
A police chief has accused what he describes as counter-revolutionaries of being behind the water fights.
The events, organised on social networks online, express a boisterous youth culture that the Iranian authorities see as a threat.
Acting head of police General Ahmad Radan accused the organisers of trying to break customs and said those responsible would be put on trial.
