RAMADI, Iraq — Large, noisy demonstrations against Iraq's government flared for the third time in less than a week Wednesday in Iraq's western Anbar province, raising the prospect of a fresh bout of unrest in a onetime al-Qaida stronghold on Syria's doorstep.

The rallies find echoes in the Arab Spring. Protesters chanted "the people want the downfall of the regime," a slogan that has rippled across the region and was fulfilled in Tunisia and Egypt. Other rallying cries blasted Prime Minister Nouri al-Maliki's government as illegitimate and warned that protesters "will cut off any hand that touches us."

While the demonstrators' tenacious show of force could signal the start of a more populist Sunni opposition movement, it risks widening the deep and increasingly bitter rifts with the Shiite-led government in Baghdad. If left unresolved, those disputes could lead to a new eruption of sectarian violence.

The car bombings and other indiscriminate attacks that still plague Iraq are primarily the work of Sunni extremists. Vast Anbar province was once the heart of the deadly Sunni insurgency that emerged after the 2003 U.S.-led invasion, and later the birthplace of a Sunni militia that helped American and Iraqi forces fight al-Qaida.

Today, al-Qaida is believed to be rebuilding in pockets of Anbar, and militants linked to it are thought to be helping Sunni rebels try to overthrow Syrian President Bashar Assad.

The demonstrations follow the arrest last week of 10 bodyguards assigned to Finance Minister Rafia al-Issawi, who comes from Anbar and is one of the central government's most senior Sunni officials. He appeared before Wednesday's rally and was held aloft by the crowds.

Al-Issawi's case is exacerbating tensions between the Shiite-dominated government that rose to power following the 2003 U.S.-led invasion and Iraq's Sunnis.