Algeria was mobilising the army on Thursday after 22 people were killed in the worst ethnic clashes between Berbers and Arabs in years, as more details emerged of the violence.

The fighting erupted late on Tuesday in the town of Guerara in the M’zab valley, a UNESCO world heritage site on the edge of the Sahara that has seen mounting tensions between its Berber and Arab communities.

An AFP photographer who toured the town on Thursday saw makeshift barricades of tyres and wheelbarrows erected between the rival neighbourhoods and burned out homes, shops and cars. […]