Litvinenko killing was 'state-sponsored action': Cameron

British Prime Minister David Cameron said Russian ex-spy Alexander Litvinenko was murdered in a "state-sponsored action" after an inquiry into his death reported back Thursday.

"What happened was absolutely appalling and this report confirms what we've always believed, and what the last Labour government believed at the time of this dreadful murder, which is it was state-sponsored action," he said in a clip to British television from Davos.

Britain did not announce new sanctions Thursday as a result of the killing but did impose asset freezes on the two Russian prime suspects in the case, Dmitri Kovtun and Andrei Lugovoi.

"We must now read the report in its entirety and take everything into account but be in no doubt, this shocking event was reacted to years ago when it happened and we're toughening our action again today," Cameron added.