...as Prince and Diana shrug off Welsh bomb . . .

Prince Charles and Princess Diana, shrugging off a bomb threat, mingled with cheering crowds Tuesday at the start of a three-day visit to Wales, the couple's first major official duty together since their honemyoon.

The tour went ahead despite discovery Monday of a firebomb on their scheduled route. The bomb, believed planted by Welsh nationalist extremists, was defused after a telephone tip.

Police tightened already heavy security, but Charles, who is the Prince of Wales, and Diana appeared relaxed and cheerful when they stepped off their special train at Shotton to begin their tour.