• A man walks by a military vehicle in front of the old stock exchange in the center of Brussels on Saturday, Nov. 21, 2015. Belgium raised its security level to its highest degree on Saturday as the manhunt continues for extremist Salah Abdeslam who took part in the Paris attacks. The security levels shut down all metro lines and shuttered many shops as well as canceling sports matches. (AP Photo/Virginia Mayo)

    Brussels under serious terrorism threat after Paris attacks

    BRUSSELS (AP) — Belgian authorities closed down Brussels’ subway system and flooded the streets with armed police and soldiers Saturday in response to what they said was a threat of Paris-style attacks.