By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s benchmark stock index was on track to break a two-day winning streak on Monday, with banks and oil firms leading the charge south, while a well-received earnings report from Aggreko PLC sent the company's shares rallying in London.

The FTSE 100 index slipped 0.1% to 6,713.14, retreating from the highest closing level since May, reached on Friday.

Among notable movers in the index, Aggreko climbed 5.3% after the provider of temporary-power solutions said it expects full-year pretax profit to be in line with the market's expectations. It also reported third-quarter revenues and margins slightly ahead of the same period last year.

Shares of Randgold Resources Ltd. gained 4.8% after the gold miner said it plans to "aggressively" explore opportunities in the Ivory Coast.

Other mining firms were mostly lower, as metals prices were mixed. Antofagasta PLC dropped 0.7%, Anglo American PLC lost 0.6% and Rio Tinto PLC (RIO) fell 0.6%.

Energy firms were also on the decline, with shares of BG Group PLC down 1.4% and BP PLC (BP) 0.5% lower.

Tullow Oil PLC fell 1.3% after the oil explorer said it has temporarily suspended all operation at two areas in Kenya due to labor unrest.

Shares of InterContinental Hotels Group PLC dropped 2.2% after the hotel operator posted a weaker-than-expected third-quarter trading update.

Lloyds Banking Group PLC (LYG) gave up 1.1% after Investec Securities cut the firm to hold from buy ahead of the bank's third-quarter results on Tuesday.

Other banks were also on the decline in London, with shares of Barclays PLC (BCS) down 2.1% and Royal Bank of Scotland Group PLC (RBS) off 0.5%.

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