British authorities say snow and freezing temperatures are continuing to cause chaos for road, rail and air passengers after a weekend of disruption. London's Heathrow Airport, Europe's busiest, said on Monday it expected only a limited number of flights to arrive and depart. Hundreds of passengers camped overnight in terminal buildings after services were canceled or delayed. British travel industry group ABTA has warned that it is almost inevitable that some cancellations and delays will continue through this week, the Associated Press reported. Temperatures plunged to a record low overnight in Northern Ireland, and forecasters predicted fresh deluges of snow across Britain. Motoring organizations warned of potentially fatal conditions on Britain's icy roads.