Liberia is already under a state of emergency
Liberia has imposed a night-time curfew and has quarantined an area of the capital Monrovia in a bid to halt the deadly Ebola outbreak.
President Ellen Johnson Sirleaf said the curfew would be from 21:00 local time to 06:00 (21:00-06:00 GMT).
She said all movement would be blocked in and out of the West Point area.
Meanwhile, three doctors with Ebola who started taking an experimental drug last week showed remarkable signs of improvement, a Liberian minister said.
Information Minister Lewis Brown said the drug was given to one Nigerian and two Liberian doctors who had caught Ebola while helping to save the lives of other victims of the virus.
See further BBC coverage: http://www.bbc.com/news/world-africa-28754546