News agency TT reported that three people had been remanded in custody so far and that a fourth who was 17 years old was released.
"I believe there is probable cause for all 14 on the official charge," said Sara Friedman, who is leading the investigation, speaking with newswire TT.
The detention hearings (häktningsförhandlingar) for the four were held at the Södertörn district court Thursday afternoon. A 33-year-old Ukrainian citizen denied the charges. Two Polish citizens, aged 31 and 22, were also detained.
The 17-year-old suspect was released. Swedish law stipulates that people under 18 years of age may only be arrested for serious crimes. The current charge is preparation of aggravated assault.
The men were arrested in the vicinity of an asylum accomodation, which police suspect was the target of an attack. Police were tipped off and questioned the suspects. In their cars police found sticks, knives, iron bars, and axes.
"Most have made partial confessions, you could say. No one really wants to tell why they were there. They were at the scene and confirm that they had been in contact with each other before," said Tobias Vilhelmsson, a prosecutor.
The men's date of births range from 1975 to 1998. Some lived and worked in Sweden, according to the police. Others were only visiting. Most of the group were Polish citizens, according to the prosecutor, but she would not confirm the police's claim that the men might belong to a right-wing group.
Increased security at refugee reception centres2:21 min 2:21 min
Fourteen arrested for planning attack on asylum centre1:33 min 1:33 min