A PASSENGER BUS smashed through a barrier and tumbled off a bridge into a deep canal Monday near Dhaka, Bangladesh, killing at least 48 people and injuring 110, officials said. . . . BRITAIN IS PREPARING a royal welcome for Polish President Lech Walesa, who arrives Tuesday for the first visit to the country by a Polish head of state. . . . FORMER EAST GERMAN leader Erich Honecker has left Moscow after protests from city leaders who declared him an unwelcome guest, a newspaper reported Monday.