All vehicles wishing to enter or leave the troubled areas are checked at roadblocks, set up by local authorities since the beginning of events, the same source added.
Clashes between Spanish police and local youth began on Tuesday in some areas of the occupied city before spreading to other neighborhoods, following the announcement by the local government of the list of beneficiaries of an employment programme that excludes dozens of young people, mostly Moroccans.
The police used tear gas to disperse the crowds, who responded by putting up barricades and burning tires and garbage dumpsters. Several vehicles were also torched.
To contain the situation of tension, reinforcements of police were rushed on Wednesday from Spain and more others will arrive on Thursday in the occupied city.