Police have been given more time to question five Birmingham men they arrested under the Terrorism Act, after completing searches at six properties.
West Midlands Police arrested the men in dawn raids on Tuesday, following a "long and complex" investigation by the region's Counter Terrorism Unit.
Officers have been granted warrants to detain the men, aged between 29 and 36, for up to seven days from the time they were arrested.
Police raided five addresses in the Ward End, Sparkhill, Bordesley Green, Hodge Hill and Aston areas of Birmingham at around 6am on Tuesday, with searches also carried out at another home in Stechford, and a commercial property in Kenilworth, Warwickshire.
Forensic teams have left six of the properties, taking "a large number of items" for examination, and continue to search another business address in central Birmingham, as well as the Hodge Hill site.
The five men are being detained on suspicion of being involved in the commission, preparation or instigation of an act of terrorism.
Family and neighbours of the man arrested in Sparkhill expressed shock, describing him as a quiet and hard-working family man.
Speaking outside his home in Benton Road on Tuesday, Sobat Khan, 66, said he was disturbed in the morning by six officers arresting his son, 29-year-old Mohammed Shabir.
Mr Khan said his son, who works in a steel factory in West Bromwich, had a wife and an eight-year-old son who live with him at their terrace home. The father of four said: "I was shocked. I had been asleep. My son didn't say anything, he just went with them.
"He is not bad, he has never been bad. All his life, I have had no trouble from him. He just goes to work, that is all.
"I said to the police 'You think I make bombs in my house? You look'."
Mr Khan said his son came to Birmingham from Pakistan as a six-month-old baby and had not left the country since.
Neighbours also expressed shock at Mr Shabir's arrest, describing him as a quiet family man.
Imran Salemm, 27, said: "I can't believe he has been arrested. He is the quietest guy you could meet. He is so quiet he walks down the street with his head down. His whole family is down to earth and quiet.
"He is nice, but he doesn't have much to say. He just spends time with his family. He is the last person I would expect to be arrested. I am shocked.
"If people are planning terrorism, then they need to be arrested, but the police must have it wrong, he is not like that."