BRUSSELS (AP) — As police armed with automatic weapons stood guard, schools and some subway stations in the Belgian capital reopened Wednesday for the first time since emergency measures were imposed four days ago in the wake of the Paris attacks. Despite the easing of restrictions, Brussels — home to the European Union and NATO headquarters — remained under the highest alert level due to what authorities have described as a serious and imminent threat of attack. Some children looked visibly worried as they arrived, but most gave a friendly handshake to a burly school official guarding the entrance alongside the police officers. Authorities in France and Belgium have issued public appeals for help in tracking down two men believed directly linked to the Paris attacks that killed 130 people and wounded hundreds on Nov.