The authorities in Pakistan have mounted a big security operation to prevent a mass protest against emergency rule planned by the detained opposition leader, Benazir Bhutto.
Police blocked all roads to Ms Bhutto's house in Lahore, where she is under a seven-day detention order, and surrounded it with a cordon of vehicles, barbed wire and metal barriers.
Ms Bhutto had been hoping to lead a 270km (170-mile) march from Lahore to the capital, Islamabad, to protest against the state of emergency declared by President Pervez Musharraf.
Speaking on the telephone from her house, Ms Bhutto ruled out serving under General Musharraf in any future government and called on him to step down.
Dozens of the former prime minister's supporters, arriving to protest against her detention, were bundled into police vans and taken away.
The Pakistani government says the planned march defies emergency laws and that they have placed the Pakistan People's Party leader under house arrest for her own safety.
Gen Musharraf is under growing pressure from Western allies to put Pakistan back on the road to democracy. The country is facing possible suspension from the Commonwealth.