Tunisia: President's party quits government

Moncef Marzouki, President of Tunisia, shows his "Liberty passport" he was given as he was living in exile in France years ago and was forbidden to return his native country, during a statement at the European Parliament in Strasbourg, eastern France, Wednesday, Feb.6, 2013. Marzouki, who is from a secular party in the governing coalition, was in Strasbourg addressing the European Parliament and said the assassination was a threat against all of Tunisia. Chokri Belaid, a Tunisian opposition leader critical of the Islamist-led government and violence by radical Muslims was shot to death Wednesday _ the first political assassination in post-revolutionary Tunisia. (AP Photo/Christian Lutz) (The Associated Press)

Activists of the Islamic Party's Ennahda as they wave is flags during a demonstration in Tunis Saturday Feb 9, 2013. Several thousand supporters of Tunisia's ruling moderate Islamist party rallied in the capital in a pro-government demonstration Saturday, a day after the funeral of an assassinated opposition politician. The ruling Ennahda party had called for a show of support for the constitutional assembly, whose work on a new constitution suffered a severe setback after the killing of Chokri Belaid on Feb. 6, 2013 when leftist parties withdrew their participation. Protesters hurled insults at France, accusing the former colonial ruler of interfering in the North African country's politics. ( AP Photo/Hassene Dridi) (The Associated Press)

Protesters gather during a demonstration in Tunis Saturday Feb 9, 2013. Several thousand supporters of Tunisia's ruling moderate Islamist party rallied in the capital in a pro-government demonstration Saturday, a day after the funeral of an assassinated opposition politician. The ruling Ennahda party had called for a show of support for the constitutional assembly, whose work on a new constitution suffered a severe setback after the killing of Chokri Belaid on Feb. 6, 2013 when leftist parties withdrew their participation. Protesters hurled insults at France, accusing the former colonial ruler of interfering in the North African country's politics. ( AP Photo/Hassene Dridi) (The Associated Press)

Tunisian President Moncef Marzouki's secular party is quitting the coalition government in anger at the dominant Islamist party's handling of the country's political crisis.

The move by the Congress for the Republic party threatens to deepen the crisis, prompted by the killing of an opposition leader last week.

Marzouki was a longtime human rights activist whose ascension to the presidency was seen as a sign of Tunisia's democratic progress after it overthrew a longtime authoritarian president in 2011.

The state news agency TAP says the Congress for the Republic party said Sunday that it is quitting the coalition government, which is led by Islamist party Ennahda.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

Calm is returning to the streets of Tunisia's capital, even as pressure is growing on the governing Islamists to find a solution to the country's biggest crisis since it set off the Arab Spring uprisings two years ago.

The killing of a Tunisian opposition leader last week brought protests against a government accused of pandering to extremists. The prime minister wants to appoint a new government of technocrats to ease tensions.

But his Ennahda party rejects the idea. Ennahda's governing committee is meeting Sunday to discuss it, amid signs of a growing split between party moderates and hard-liners.

After three days of street violence, the streets in the capital Tunis are relatively quiet Sunday, under the watchful eye of riot police.