Belgian Prime Minister Charles Michel says that the terror alert remains at the highest level for a sustained "serious and imminent" threat against the capital.<br />Michel said that like the weekend, authorities fear a Paris-like attack, "even perhaps at several locations."<br />He said schools and the subway system in Brussels would not open.<br />The Belgian capital remained under the country's highest terrorism alert level, level 4, with soldiers and heavily armed police in the streets, after authorities warned Friday night of a possible imminent threat to the capital.<br />People are also being warned to avoid gatherings.<br />Bernard Clerfayt, mayor of Brussels's Schaerbeek district, "It is very clear that there is a cell.<br />There are two terrorists on the Brussels soil, who might be in the process of conducting acts that are very dangerous."