DDOS or stupid ISP
So actually, we really don't know if it was a DDOS or their ISP. The ISP could have claimed that they were offline due to a DDOS attack, when in reality a cable could have been unplugged.
"While it is likely a local operator might have experienced a brief outage, we have no knowledge of a national Internet outage and there are no data to substantial [sic] that."
As far as targets go, Liberia isn't one I would expect.