Police have searched two homes in the Easton area of Bristol
Police have been given more time to question a 19-year-old man arrested in Bristol under the Terrorism Act.
The man, from the Easton area, is being held as part of an investigation into Andrew Ibrahim, 19, who was charged under the Terrorism Act in April.
Mr Ibrahim, of Westbury-on-Trym, Bristol, has been remanded in custody on charges of plotting terrorism acts.
A police spokesman said detectives now have until Monday to quiz the teenager, after an application made on Wednesday.
The new suspect's home is being searched by police following his arrest on Monday.
An examination of a second property ended with "nothing of any significance" being found, Avon and Somerset Police said.
Ibrahim is accused of being in possession of two home-made vests, ball bearings, nails and screws and making or having an explosive with intent.
His trial is expected to take place in January next year.