ISLAMABAD, Pakistan (CNN) -- Barely a year after the country celebrated its return to democracy, Pakistan is ensnared in a new political crisis.





Riot police block a street on Thursday leading to a court building in Karachi, Pakistan.





Thousands of lawyers planned a four-day march to the country's capital, Islamabad, on Thursday, demanding that the government immediately reinstate judges whom the previous president ousted.





The protesters plan a sit-in at the parliament building on Monday, and say they will continue their demonstrations indefinitely until their demands are met.





At the same time, the country's main opposition leader and his supporters have joined in the nationwide protests, but for reasons of their own.





The government responded by banning political demonstrations in two of the country's biggest provinces -- Punjab and Sindh. It also detained several hundred activists Wednesday.





The political chaos has forced the government's attention away from a deadly fundamentalist insurgency in its tribal areas and an economy that's on the verge of collapse.





To understand the reasons behind Pakistan's latest political chaos, one needs to keep three central characters in mind:





What do the lawyers want?





The lawyers want President Zardari to live up to a promise to reinstate judges sacked by former President Musharraf.





Musharraf fired about 60 judges when he declared a state of emergency in November 2007. The fired judges include 14 of 18 judges who sat on the Supreme Court, including Chief Justice Iftikhar Chaudhry.





Critics say Musharraf sacked the judges because they were preparing to rule against the legitimacy of his third term in office.





He had been re-elected president by a parliament stacked with his supporters, they said.





After sweeping into power in parliamentary elections last year, the ruling Pakistan Peoples Party promised to reinstate the judges within 30 days of taking office. The deadline came and went.





Why have the judges not been reinstated?





One reason behind the delay, some experts have surmised, may be that the Supreme Court was expected to look into the controversial amnesty granted to former PPP leader Benazir Bhutto and her husband and current party head, Zardari, for corruption charges.





When Bhutto was prime minister, Zardari was accused many times of corruption, stealing from government coffers and accepting kickbacks. Pakistanis derisively labeled him "Mr. 10 percent."





Zardari said the cases were politically motivated. He spent several years in jail on the charges but was never convicted.





Bhutto herself faced corruption charges in at least five cases, but was not convicted.





In October 2007, with his popularity plummeting and under pressure from the West to hold elections, Musharraf allowed Bhutto to return from exile and participate by granting her and her husband amnesty.





Bhutto was assassinated during a campaign rally. Her husband became head of the party and the new president of Pakistan.





Why is the opposition protesting?





The country's second-biggest party, the Pakistan Muslim League -- N (PML-N), is led by opposition leader and former Prime Minister Sharif.





Last month, the Supreme Court ruled that Sharif cannot hold public office, citing a criminal record that dates to the late 1990s.





The court also stripped Sharif's brother, Shahbaz, from his post as chief minister of Punjab -- the Sharif party's power center.





The Sharifs condemned the court's decision as politically motivated. They accuse the court of acting at the behest of Zardari.





Adding to their outrage, Zardari suspended Punjab's parliament and imposed executive rule there for two months.





The Zardari administration said the executive rule was needed to maintain stability in the province. Supporters of PML-N have rallied in large numbers opposing the ruling.





Why did the court bar Nawaz Sharif from elected office?





The case against Sharif dates to the late 1990s, when he was prime minister. At the time, Musharraf was military chief. And Sharif feared Musharraf was plotting his ouster.





When Musharraf was returning home from an overseas trip, Sharif refused the airliner to land.





That order eventually led to Sharif's conviction for hijacking and treason when Musharraf took power
What may the political protests divert attention from? Whose reinstatement is demanded? What might protests divert attention from?
a deadly fundamentalist insurgency in its tribal areas and an economy that's on the verge of collapse. President Musharraf. deadly fundamentalist insurgency
question: What may the political protests divert attention from?, answer: a deadly fundamentalist insurgency in its tribal areas and an economy that's on the verge of collapse. | question: Whose reinstatement is demanded?, answer: President Musharraf. | question: What might protests divert attention from?, answer: deadly fundamentalist insurgency