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According to Reuters, the market was down 1.5 per cent at 11:46 BST, dropping to 4,300.73 points after recording a slight gain during trading on Friday.
Energy firms led the decline, with BP, Cairn Energy, Royal Dutch Shell, Tullow Oil and BG Group falling by between 0.7 per cent and 3.9 per cent.
Mining firms were also weaker, while Barclays and Lloyds Banking Group slipped 2.5 per cent and 5.3 per cent respectively.
"Energy and commodity stocks ... are vulnerable to a pull-back, particularly if the outlook for world economic growth is being questioned again," equities analyst Paul Kavanagh was quoted as saying.
And market strategist Joshua Raymond noted that the news from North Korea had left investors "anxious", with a "fear of escalating tensions" impacting trading.
