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 Qaeda stronghold on Syria’s doorstep.

The rallies echo 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.’’