(Adds Georgian reaction)

MOSCOW, Aug 19 (Reuters) - The head of Russia's main domestic security service accused Georgia on Tuesday of plotting terrorist attacks in Russia following its war with Moscow and ordered extra security at key sites.

Russian news agencies quoted Federal Security Service (FSB) chief Alexander Bortnikov as saying Russia had information that "Georgian security forces" were planning a number of "terrorist acts" against strategic locations.

"We should pay special attention to the anti-terrorist protection of key infrastructure sites," he was quoted by Interfax news agency as telling a security meeting.

Georgia quickly dismissed the accusation.

"This is complete nonsense," Interior Ministry spokesman Shota Utiashvili said. "The Russians are looking for a pretext to extend the occupation both in time and space." (Additional reporting by Tbilisi bureau; Writing by Maria Golovnina; Editing by Caroline Drees)

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