New Delhi, July 27 -- SEATTLE - A 19-year-old man and a 56-year-old woman were among three people killed on Sunday evening when gunfire erupted in the middle of the Bite of Seattle food festival, scattering thousands of diners at Seattle Center and leaving investigators searching Monday for at least one suspect still at large.

The shooting began shortly after 6 p.m. along the 200 block of Thomas Street in the Lower Queen Anne neighborhood, when authorities said at least two individuals opened fire on each other in the crowded festival grounds. A young boy was among four people hospitalised with gunshot wounds at Harborview Medical Center.

Acting Seattle Police Chief Tyrone Davis, who responded to the scene within minutes, confirmed that...