At least 24 police officers have been wounded in clashes with protesters rallying against unemployment in central Algeria, state media reported Wednesday.
Demonstrators in the central Tinerkouk area have been blocking access to an oil company since mid-April, demanding jobs in the industry.
The ongoing rally has largely paralysed work at the site, prompting police to move in and disperse it on Tuesday.
Demonstrators blocked access to the local government offices, setting fire to the buildings and looting them when the police intervened, according to reports.
Private television channel, Dzair News broadcast images of a government building in flames and protesters blocking the road with burning tyres.
A number of demonstrators were hurt in the clashes, during which police responded to stone-throwing with tear gas.
Four of the 24 officers wounded sustained serious injuries.
A quarter of Algerians under 30 are unemployed and there have been regular protests in the resource-rich centre and south of the country over a lack of development and jobs.
The clashes in Tinerkouk follow months of protests in Algeria against the ruling elite that have prompted the departure of longtime president Abdelaziz Bouteflika.
Algerians are scheduled to elect a new leader on July 4.