Authorities in Liberia have opened a new centre to treat Ebola patients in the capital after the existing one became overwhelmed with patients.

Scientists studying the lethal ebola virus say they have found how it blocks and disables the body’s ability to battle infections in a discovery that should help the search for potential cures and vaccines.

Liberia is facing an excruciating choice – deciding which handful of Ebola patients will receive an experimental drug that could prove either life-saving or life-threatening.

No one knows just how many people Patrick Sawyer came into contact with the day he boarded a flight in Liberia, had a stopover in Ghana, changed planes in Togo, and then arrived in Nigeria, where authorities say he died days later from Ebola, one of the deadliest diseases known to man.

More than 1,000 people were reported injured as Egyptian security forces clashed for a second day in Cairo with hundreds of youths.