New Delhi: Angry over the attack on Ramdev, his followers on Monday threw black ink on Sonia Gandhi's poster outside the Congress headquarters here and clashed with party workers, earning disapproval of the yoga guru who condemned the act as "undemocratic and uncivilized".

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Some people under the banner of Yuva Bharat Kisan Panchayat gathered outside the Congress headquarters at 24, Akbar Road to protest the throwing of ink on the yoga guru here two days ago.

They shouted slogans against party chief Sonia Gandhi and leaders Rahul Gandhi and Digvijay Singh and said they will not allow anyone to defame religious leaders. Some of them later threw black ink on a poster with Sonia's image.

Soon after the incident, Ramdev's spokesperson said the yoga guru termed the act as "undemocratic and uncivilized".

"Such undemocratic and uncivilized methods of protest should not be encouraged. Such acts have no place in our rich culture and philosophy," Ramdev was quoted as saying.

"We neither support such undemocratic and uncivilized act nor are part of it," the spokesperson said adding Ramdev was against any kind of violent or indecent methods of protest against anyone and urged people not to indulge in or promote such "indecent and ugly acts."

On Saturday, Kamran Siddiqui, who runs an NGO, had thrown black ink at Ramdev during a press conference when the yoga guru evaded his question on Batla House encounter.

As the protesters were outside the AICC for 5-10 minutes this evening, some Congress workers came out of the premises and entered into an argument with them leading to a scuffle. The police then intervened and brought the situation under control.

Following the incident, more police personnel were rushed to the spot which is next to Sonia's residence at 10, Janpath.