Six people have been arrested by counter-terrorism police in London for suspected activity linked to the banned militant group, the Kurdistan Workers Party (PKK).
The Metropolitan Police said two women, aged 59 and 31, and four men, aged 27, 62, 56 and 23, were arrested at separate addresses in the early hours of Wednesday.
They have all been detained under the Terrorism Act and are in custody at a London police station.
There is not believed to be any imminent threat to the public linked to the matters under investigation, the force said.