Brussels attacks: 6 detained in raids

Police detained six people in raids Thursday night as investigators raced to uncover the network behind this week's terror attacks in the Belgian capital.

The Belgian federal prosecutor's office didn't provide details about who had been detained in the Brussels raids, why they had been apprehended or whether they will face charges.

"It will be decided tomorrow if these people will remain in custody," the office said in a statement released late Thursday.

Two people were taken into custody in Brussels' Jette neighborhood, one person was detained in a different part of the capital, and three people were in a vehicle in front of the federal prosecutor's office when authorities apprehended them, public broadcaster RTBF reported.
So far, authorities have said they believe five men played a part in Tuesday's bombings in Belgium that killed 31 people and injured 330. Three of the attackers are dead. Two of them could still be on the loose.

Investigators are combing over evidence from surveillance footage and the explosives stash they seized from an apparent hideaway in a suburb.

Any clue, any lead, any witness could be critical in the race to stop the next terrorist attack on European soil.

Sweeps where investigators detain people first and ask questions later are likely to become an increasingly common tactic, CNN national security analyst Juliette Kayyem said.

"There will be lots more of them," she said. "They are going to be what's called overbroad. They are going to just try to find people or evidence that may stop the next terrorism attack, and they will figure out who they have under custody."

Khalid El Bakraoui, one of the terrorists who bombed a train near the Maelbeek metro station, is dead. Authorities believe a second unidentified person was also involved in that attack, a senior Belgian security source told CNN. But investigators don't know where that suspect is -- or whether he's dead or alive.

Surveillance footage shows the man holding a large bag at the station, according to Belgian public broadcaster RTBF. It's not clear if he was among the at least 20 killed in that blast, RTBF said.

(CNN)