The day after terror attacks in Paris left at least 127 dead and some 300 wounded, attention has turned to Belgium. Several arrests were made in Belgium today (Nov. 14), and a black Volkswagen Polo with a Belgian license plate had been spotted on the night of the attacks near the Bataclan theater. Police have raided a Brussels neighborhood where three of the eight attackers are believed to have lived.

More fighters have joined ISIL from Belgium, per capita, than any Western nation.

Belgian federal home affairs minister Jan Jambon has previously described Brussels as a weak link in the fight against terror. Speaking at a debate last week, he said: “The thing that keeps me awake at night is the guy behind his computer, looking for messages from IS and other hate preachers.”

Jambon also reportedly warned of the growing use by terror networks of the PlayStation 4 gaming console, which allows terrorists to communicate with each other and is difficult for the authorities to monitor. “PlayStation 4 is even more difficult to keep track of than WhatsApp,” he said.

The gaming console also was implicated in ISIL’s plans back in June, when an Austrian teen was arrested for downloading bomb plans to his PS4.