ISLAMABAD — Police swung batons and fired tear gas at supporters of a former prime minister, Benazir Bhutto, demonstrating near Pakistan’s parliament today, deepening a political crisis triggered by the imposition of military rule.

Hundreds of protesters pushed metal barricades into ranks of riot police blocking their path toward the parliament building, where state television reported that government lawmakers unanimously endorsed President Musharraf’s declaration of emergency rule.

Police beat several activists, some of them women, who broke through, and dragged at least six people from the scene.

A close female aide to Ms. Bhutto, Naheed Khan, struck a policeman on the shoulder and screamed at him: “Who are you? How dare you take action against women?”

The demonstrators pulled back amid a cloud of tear gas, chanting “Benazir! Benazir!” and “Down with the emergency!”

Thousands of people have been rounded up and put in jail or under house arrest since General Musharraf declared a state of emergency Saturday, and three days of protests by lawyers have been quickly put down with force.

Violent clashes with Ms. Bhutto’s supporters could increase the uncertainty engulfing the country. Ms. Bhutto set a collision course with General Musharraf today by calling her supporters to defy a ban on rallies by marching on parliament and also attending a mass rally in the nearby city of Rawalpindi on Friday.

“I request my brothers and sisters to reach Rawalpindi at all costs,” Ms. Bhutto told a news conference.

But the mayor of Rawalpindi, a garrison city just south of Islamabad, said police would prevent anyone reaching the park where Ms. Bhutto hoped to address supporters on Friday.

“We will ensure that they don’t violate the ban on rallies, and if they do it, the government will take action according to the law,” mayor Javed Akhlas said.

General Musharraf suspended the constitution after declaring the state of emergency. He has since ousted independent-minded judges, put a stranglehold on the media and granted sweeping powers to authorities to crush dissent.

With the encouragement of America, General Musharraf had held negotiations with Ms. Bhutto widely expected to lead to a power-sharing arrangement after parliamentary elections originally slated for January.

Ms. Bhutto said yesterday that General Musharraf’s resort to authoritarian measures was a “breach of trust” with her and that the talks were off. However, she also suggested that they could resume if circumstances change.

“I think we should all come down as strongly as we can for the restoration of democracy. And if General Musharraf wants to find a way out, well the ball is in his court,” she said.