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Activists lie on the street pretending to be dead during a flash mob in Guadalajara, Mexico. PHOTO: Hector Guerrero, AFP/Getty Images

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While the use of social networks is growing in Mexico, the country had largely escaped the kind of rapidly formed, fast-moving youth mobs seen in Europe and the United States.

City police chief Manuel Mondragon said Monday that two young men had called on other people to gather for a concert of reggaeton music at a bar. Hundreds more showed up than could fit.

Mondragon says angry youths who couldn't get in to the Sunday concert went on a rampage at subway stations, damaging turnstiles and streetlamps, robbing people and tossing fireworks. Police say 39 people were released Monday because of lack of evidence.