BRUSSELS (AP) — Brussels remains on high alert with increased security after a weekend sweep which left three in jail facing terrorism charges.

The MIVB metro system says a half dozen subway stations have reduced entry on request from authorities but all subway lines were running during the morning rush hour Monday.

On Saturday, authorities charged three men with terror-related crimes after weekend raids and the detention of 40 people in a major investigation. Authorities said the probe required "immediate intervention" because they feared a new attack was close.

Prime Minister Charles Michel said the nation would remain "extremely vigilant, hour by hour," and that the terror level across the country would remain at the second-highest level, meaning a threat of an attack "is possible and likely."