Popular among East African communities, the amphetamine-like drug khat was outlawed in the UK in June. Channel 4 News joined police in a crackdown on sellers.
Al-Shabaab militants, who threatened to step up attacks during the Muslim fasting month of Ramadan, say they were behind a blast that killed four people near the Somali parliament building.
Al-Shabaab's attack on Kenya over the past two nights, in which more than 60 were killed, shows the group still poses serious threat to the region's stability, writes Jamal Osman.
Last year, we filmed with Abdullahi, a mentally ill Somali man who had been in chains or 17 years. But one mental health nurse has changed his life forever.
Coming through passport control is an ordeal. I am followed on the street and hassled by security services. Not all citizens enjoy the same rights, writes Jamal Osman.
From Somalia to South Africa, our reporter Jamal Osman retraces the journey he took as a desperate refugee, fleeing Somalia's brutal civil war 18 years ago. Follow his interactive video diary here.
Every year, thousands flee their country to escape war, drought or poverty. In 1996 in Somalia, Africa Reporter Jamal Osman was one of them. Here, he retraces his steps and meets those trying it now.
In 10 years only one of our journalists has been stopped at Heathrow and questioned but it happens virtually every time he goes through the airport, writes Channel 4 News Editor Ben de Pear.
Since the Westgate shopping mall attacks, many Kenyans now live in fear. But the government's anti-terror crackdown has angered many Muslims, some of whom have flocked to al-Shabaab.