Police in Belgium have detained a 19-year-old man on suspicion of planning a terrorist attack on a Jewish institution and illegally procuring weapons, the public prosecutor’s office announced on Sunday evening, according to the Belgian news agency Belga. The investigators did not initially provide any details about the alleged attack plans or the suspect’s motives. They did confirm, however, that police in Antwerp had received a tip-off about the man on Friday evening. He was then detained on Saturday. A court of inquiry is to decide on a possible arrest warrant for the man, who was said to ha…