A man and a woman from Birmingham have been arrested on suspicion of possessing documents likely to be of use to someone committing or preparing an act of terrorism.
The two, a brother and sister aged 23 and 18, were arrested this morning in the Small Heath area of the city.
The arrests are said to have been pre-planned and police say they were not made in response to any threat to public safety.
Computers and other electronic devices which will undergo forensic examination.
Officers say a number of files need to be investigated, which is likely to take some time.
More top news
A forklift truck driver has walked free after 4,000 tonnes of cheese came down on him, trapping him for eight hours in Market Drayton.
Two men have been found guilty of shooting dead a Birmingham teenager following a dispute over a £50 bag of cannabis.
Most areas will have increasing cloud and some northern areas will turn misty with possible fog by the end of the night.