By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Most U.K. stocks slipped into negative territory on Monday amid ongoing concerns about a government shutdown in the U.S. and after disappointing Chinese manufacturing data.

The FTSE 100 index dropped 0.8% to 6,458.04, on track for the lowest close in September.

Mining firms added the most pressure on the London benchmark, weighed by weaker-than-expected data from China. The HSBC China Manufacturing Purchasing Managers' Index for September came in at 50.2, lower than the preliminary reading of 51.2. Metals firms are sensitive to growth indications from China, as the country is a major user of natural resources.

Shares of Glencore Xstrata PLC (GLCNF) lost 2.5%, Rio Tinto PLC (RIO) dropped 2.4%, Anglo American PLC gave up 2.3% and BHP Billiton PLC (BHP) fell 1.4%. Metals prices were also mostly lower.

Among other resource firms, shares of BP PLC (BP) erased 1% as the oil giant prepared to go to court in New Orleans on Monday for the second phase of its trial over the 2010 Deepwater Horizon oil spill in the Gulf of Mexico.

Other oil firms were also on the decline, tracking oil prices lower. Shares of BG Group PLC dropped 1.1%, and Royal Dutch Shell PLC (RDSB) slipped 0.4%.

More broadly, investors were hesitant to place any big positions in the stock markets as uncertainty over the U.S. budget lingered. The government could face its first shutdown in 17 years after lawmakers over the weekend failed to agree on a budget for the new fiscal year, which starts on Tuesday, Oct. 1. If House Republicans and Senate Democrats cannot agree by a Tuesday morning deadline, thousands of government employees will be unable to work.

Banks, which tend to be among biggest fallers when investors shun risk, were on the decline. Shares of Royal Bank of Scotland Group PLC (RBS) dropped 2.3%, Lloyds Banking Group PLC (LYG) lost 1.2%, and heavyweight HSBC Holdings PLC (HBC) eased 1.2%.

On a more upbeat note, shares of Persimmon PLC gained 2.3% after J.P. Morgan Cazenove lifted the home builder to overweight from neutral. The analysts said they "continue to see scope for Persimmon to beat on expectations around the timing of its cash-return program."

In the same vein, shares of William Hill PLC added 0.7% after Deutsche Bank raised the bookmaker to buy from hold.

Shares of Shire PLC climbed 0.7% after J.P. Morgan Cazenove lifted the pharmaceutical firm to overweight from neutral.

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