Commuters head back to work Monday following London attack; 2 men remain in custody

LONDON (AP) — British police are still holding two suspects in custody over the London subway blast as commuters head to work Monday in the first morning rush hour since the attack.Authorities have reduced the terror threat level from "critical" to "severe," indicating another attack is highly likely but no longer believed to be imminent. Police have asked the traveling public to be vigilant and to expect to see an increase in armed police.Meanwhile, closed-circuit television images, acqui