Jittery Chinese authorities wary of any domestic dissent staged a concerted show of force Sunday to squelch a mysterious online call for a "Jasmine Revolution" apparently modeled after pro-democracy demonstrations sweeping the Middle East.

Authorities detained activists, increased the number of police on the streets, disconnected some mobile phone text messaging services and censored Internet postings about the call to stage protests at 2 p.m. in Beijing, Shanghai and 11 other major cities.

The campaign did not gain much traction among ordinary citizens and the chances of overthrowing the Communist government are slim, considering Beijing's tight controls over the media and Internet. A student-led, pro-democracy movement in 1989 was crushed by the military and hundreds, perhaps thousands, were killed.

On Sunday, police took at least three people away in Beijing, one of whom tried to lay down white jasmine flowers while hundreds of people milled about the protest gathering spot, outside a McDonald's on the capital's busiest shopping street. In Shanghai, police led away three people near the planned protest spot after they scuffled in an apparent bid to grab the attention of passers-by.

Many activists said they didn't know who was behind the campaign and weren't sure what to make of the call to protest, which first circulated Saturday on the U.S.-based, Chinese-language news website Boxun.com.

The unsigned notice called for a "Jasmine revolution"