Mourners are laying flowers near the scene of the deadly Christmas market attack as investigators puzzle over the motive of the suspect.

Thousands of people in Magdeburg formed a human chain on Monday to remember the victims of the attack on a Christmas market in the central German city, as the far-right Alternative for Germany (AfD) held a rival rally.

Magdeburg's Christmas market is a sad sight. This should have been the busiest weekend of the season, but the whole area has been cordoned off and all the stands are shut. Police are the only people walking around the boarded-up mulled wine and gingerbread stalls.