Several cities in north east Brazil are suffering from serious unrest caused by marauding criminal gangs.

For the third night, gang members set buses ablaze and carried out gun attacks on buildings in urban areas in Rio Grande do Norte state.

The attacks are thought to have been sparked by conditions in jails holding gang members.

Brazil’s government sent hundreds of federal security forces to the region earlier this week.

Justice and Security Minister Flavio Dino said hundreds more could be sent in the coming days as unrest continues. The state government has convened a crisis cabinet and has asked the federal government for more support.