How Do Active Shooter Drills Affect Kids?

In the United States, the recent Florida school shooting has led education authorities to take a fresh look at the issue of on-site security. And for many schools that means getting their pupils to take part in what are called "active shooter drills". What efeect are they having on young people?

We hear from Nigeria with a very personal insight into what happened two weeks ago, in the north-eastern town of Dapchi - the scene of another mass kidnapping being blamed on Boko Haram.

Russia has developed a new array of nuclear weapons that are invincible, according to President Vladimir Putin. Mr Putin made the claims as he laid out his key policies for a fourth presidential term, ahead of an election he is expected to win in 17 days' time.