Brussels police have detained five people in two separate raids in the city of Laeken and Dansaert district believed to be connected with the Paris attacks.
Police forces raided a building in the Dansaert district on Sunday arresting two brothers as well as their friend, a raid that lasted for five hours.
"A thorough analysis of phone records was the basis for this house search," prosecutors have stated.
"They have been taken in for questioning," Eric Van Der Sypt, spokesman for the federal prosecutor, said about the arrested.
The second investigation in the Laeken area on Monday resulted in the arrest of two more people.
"Regarding the results of the searches no further details will be provided. No explosives or weapons were found," the statement added.
According to AFP, pedestrians were asked to leave the area from 6 pm to 11 pm local time.
However, police forces are still looking for Brussels-born Salah Abdeslam, who is still on the run, a main suspect of the Nov.13 Paris attacks that left 130 people dead.