Industrial output across the UK dropped unexpectedly in October, declining at its fastest pace in more than a year.
The figures show economic growth could be slowing
Output from factories, mines and utilities fell 0.8% in October, the biggest fall since August 2005, said the Office for National Statistics.
Output for manufacturers alone fell 0.4% in October, the worst performance in 12 months.
Despite the dips in output, the Bank of England is expected to keep interest rates on hold at 5% this week.
The bank has to strive to curb inflation without hindering economic growth.
October's figures were affected by a sharp fall in energy output, as mild weather reduced demand for heating.
Industrial output increased by 0.2% in September and had been expected to rise by 0.1% in October.
Investec economist Philip Shaw said the latest figures were very disappointing.