Iraj Harirchi, who has strongly denied any cover-up of a growing outbreak, has self-quarantined.
Attacks against Bernie Sanders fly in the hours before seven candidates take the stage in South Carolina.
Let's break it down by issues and compare the current field to figures in history and UK politicians.
Demonstrators try to block authorities from replacing overcrowded camps on Lesbos and Chios.
During a troublesome protest or tricky election, some countries just cut the online cord.
The clashes between Hindus and Muslims came as President Trump made his first official visit to India.
The BBC visits neighbourhoods where several people have died in violence around a citizenship law.
So far, over 200 firefighters have died of illnesses related to the 11 September 2001 terrorist attack.
The opera star says he is "truly sorry" for the hurt caused to women who accused him of harassment.
The Wikileaks co-founder was not to blame for unredacted files being published online, a court hears
Former Egyptian President Hosni Mubarak – ousted by the military in 2011 – has died in hospital in Cairo.
Officials say almost 60 people were hurt when a car drove into a crowd, 18 of them children.
Two winners split a €2,000 prize for deciphering a riddle on a rock on a beach in western France.
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