Russia observes a day of mourning for those who died after the attack at the Crocus City Hall concert venue in Moscow on Friday. At least 133 people were killed and 140 injured including many children. Also on the programme: the Nigerian army says more than a 130 schoolchildren abducted earlier this month in Kaduna state have been freed; and we hear from the brother of Paul Alexander, a polio survivor known as "the man in the iron lung", who died earlier this month. (Photo: People lay flowers at a makeshift memorial to the victims of a shooting attack in Moscow. Credit: Reuters/Maxim Shemetov)