Media reports quoted an interior ministry order, which authorised the deployment of "sufficient" military troops in Islamabad to "control law and order" in the city until further notice.
"We can see that they have various resources at their disposal".
Thousands of security forces fired tear gas and rubber bullets as the demonstrators blocked roads and burned police vehicles around the site of the sit-in, which has virtually paralysed the capital for the whole day.
Earlier, the Islamabad police, with the help of Frontier Constabulary personnel and other law enforcement agencies, launched an operation against protesters after the last of a long series of deadlines lapsed on Saturday morning without response from the agitators. The protest which has been on for the last three weeks demanding that the law minister Zahid Hamid steps down, claimed that the modification was part of a larger conspiracy even as the government called it a clerical error.
Private television channels in Pakistan were taken off the air by the Pakistan Electronic Media Regulatory Authority, according to a message slate that replaced the channels' programming.
The government also shut down Facebook, Twitter, and YouTube in Islamabad and Rawalpindi to block coverage of the operation. The police was acting on a court order which directed that the protests be cleared. He said none of the police carried firearms to avoid loss of life, instead using only tear gas and a water cannon to disperse the protesters.
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The government had made several attempts to resolve the stalemate through negotiations with the protesters, who demanded the resignation of a law minister over an omitted reference to the Prophet Muhammad in a parliamentary bill.
Where else would PROTESTERS fire teargas shells on SECURITY FORCES?
The newspaper says 150 protesters were arrested as the operation kicked off.
According to Waqt News, the security forces had dispersed half of protesters from sit-in while all protesters were dispersed from Faizabad interchange. A mob attacked former Interior Minister Nisar Ali Khan's house in Rawalpindi and broke the main gate of his house.