A man has been arrested in central England today under the 2000 terrorism act, police said.
"A 19-year-old man was arrested under the terrorism act 2000 today," said a police spokeswoman.
She said another two men, aged 24 and 36, were arrested in the same area of Birmingham "in relation to immigration matters". The nationalities of the three men were not immediately available.
The arrest comes a day after eight British suspects appeared in court charged in a plot linked to security alerts at financial targets in New York, New Jersey and Washington.
An anti-terror police spokesman said today's arrest was not related to this operation.
The eight suspects who appeared in court at a high security prison yesterday have been charged with conspiracy to commit murder and to use explosives, chemicals or radioactive materials to cause disruption, fear or injury.
They were arrested in raids two weeks ago.
Britain has arrested more than 600 terror suspects since the September 11th attacks but has charged fewer than 100 and convicted only 15 of terrorism offences.