Westgate siege survivor: 'Screams will never leave my mind'

The Westgate shopping mall in Nairobi, in which 67 people were killed in an attack by al-Shabab militants, has reopened.

It comes a week ahead of US President Barack Obama's visit to Nairobi - a sign, the city's governor said, that the capital was safe.

BBC Pop Up's Christian Parkinson joined Ben Mulwa, a survivor of the attack, as he revisited the site where he was wounded.