Kenyan police are being accused of torturing and raping refugees from the Somali community, allegations put forward by Human Rights Watch. The group released a report saying the abuses took place between November 2012 and January this year. The crackdown began after a series of bomb blasts in Nairobi. The authorities blamed Al Shabaab, fighters attempting to overthrow the government in Somalia. Al Jazeera's Peter Greste reports from Nairobi.