BASRA, Iraq — The Latest on the unrest in Iraq (all times local):

5:30 p.m.

Iraqi security forces and troops are deploying in the center of Basra and on street intersections, after hundreds of protesters torched government buildings and set fire to the Iranian consulate.

Dozens of gun-mounted black pick-up trucks belonging to the Interior Ministry and carrying masked security forces in combat fatigues were seen deploying Saturday afternoon.

Troops in Humvees also deployed on street intersections in the city center.

The deployment came shortly after an alliance of Shiite militias vowed to respond to the violent protests that have gripped the city for the past week. Health officials say at least 15 people have been killed in the weeklong confrontations.

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4:45 p.m.

The local military commander of an alliance of powerful Shiite militias is vowing to respond to weeklong protests that have turned violent in the southern city of Basra.

The commander, known as Abu Yasser al-Jaafar,i held a news conference in the city Saturday. "We will have a response to those who are carrying out acts of arson and sabotage," he proclaimed.

Angry protesters have torched government buildings and offices belonging to powerful Iranian-backed militias in weeklong protests demanding improved services and an end to corruption.

Al-Jaafari said that the lack of a response thus far should not be taken as a sign of weakness. He spoke at the city's presidential palaces compound, where Shiite paramilitary troops are stationed.

The government-sanctioned alliance of Shiite militias is known as the "Popular Mobilization Forces" or "Hashed" in Arabic. Many of the militias are backed by Iran.