Angry crowds shout at suspected Islamist extremists in the back of an army truck in Gao, northern Mali.

As French and Malian forces have retaken parts of northern Mali, there are concerns about revenge attacks.

In Gao, suspected fighters have been rounded up in house to house searches.

And Al Jazeera has seen evidence in Timbuktu of supected rebel supporters being targeted.

Al Jazeera's Jacky Rowland reports.