NEW : Prime Minister Rafaie Esawi says he believes conspirators are plotting to undermine regime . Thousands people are killed in the shootings , health officials and witnesses say . The shootings occur in Falluja in Anbar 's western Iraq province . Protesters are calling for the Kurds prime minister to step down .
NEW : Prime Minister Nuri al-Maliki says he believes conspirators are plotting to undermine regime . At least four people are killed in the shootings , health officials and witnesses say . The shootings occur in Falluja in Iraq 's western Anbar province . Protesters are calling for the Shiite prime minister to step down .