Who announced the measure after fighting broke out?

Riot police have clashed with football supporters at a friendly match between Germany and Holland at Rotterdam, prompting the city’s mayor to declare a state of emergency. The mayor of Rotterdam announced the measure after fighting broke out between rival fans in the city center. At the end of the game, which Germany won one nil, riot police made baton charges against German fans in the stadium. Police said 47 people were arrested and two fans were hospitalized with knife wounds.