Liberia's Minister of Transport, Madam Angela Cassell-Bush, has voluntarily submitted herself to be quarantined after her driver Nimene Sumo died of Ebola.

Deputy Information Minister for Public Affairs, Mr Isaac Jackson, disclosed it to reporters in Monrovia, the nation's capital city during a regular press conference on Tuesday, reported Xinhua news agency.

Mr Jackson described reports that Minister Cassell-Bush has been infected with the Ebola virus as "false and misleading".

A transport ministry press statement issued on Tuesday also clarified that the driver was directly assigned to the minister and had made no contact with her since his last day at work on Oct 3.

Mr Jackson said Madam Cassell-Bush decided to voluntarily isolate herself for a period of 21 days as a matter of precaution. The ministry of transport has also called on officials and employees who may have interacted with the driver to remain home for 21 days and observe their health conditions.

Madam Cassell-Bush is the second senior government official in Liberia to place themselves in voluntary quarantine after the chief medical officer took the same step in September when her assistant died of the deadly virus, reported Reuters. The outbreak has killed more than 4,000 people - mostly in Liberia, neighbouring Guinea and Sierra Leone - since it was first reported in March.

The chief medical officer, Ms Bernice Dahn, has been released from quarantine.