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* FTSE 100 down 0.4%, FTSE 250 off 0.3%

Sept 7 (Reuters) - UK's FTSE 100 opened lower on Thursday after stronger-than-expected U.S. economic data rekindled concerns that interest rates would stay higher for longer, while aerospace supplier Melrose Industries rose on an upbeat profit outlook.

The blue-chip FTSE 100 index fell 0.4% in early trade, while the mid-cap FTSE 250 index slipped 0.3%.

Wall Street's main indexes tumbled on Wednesday after data showed the U.S. services sector unexpectedly gained steam in August, indicating sticky price pressures.

Further weighing on the exporter-heavy FTSE 100, data showed China's exports and imports fell in August as the twin pressures of sagging overseas demand and weak consumer spending squeezed businesses in the world's second-largest economy.

Commodity-related stocks fell, with metal miners shedding 1.1% to lead sectoral declines.

Cardboard maker DS Smith and insurers Admiral and Prudential fell between 1% and 1.8% as they traded ex-dividend.

Melrose Industries jumped 7% after the company raised its annual profit expectations on the back of higher-than-anticipated margins at its engines division.

(Reporting by Siddarth S in Bengaluru; Editing by Subhranshu Sahu)