The army in Sudan has used barbed wire and concrete to block off roads leading to its headquarters in the capital, Khartoum.

The move is to prevent people gathering there to commemorate a massacre that took place at the site a year ago.

More than 100 people were killed on 3 June last year, when the army attacked and cleared a protest camp opposite the army headquarters.

The pro-democracy protesters had been there for weeks, demanding a quick transition to civilian rule after the ousting of president Omar al Bashir in April last year by a Transitional Military Council.