4 killed, including 3 children, in Chicago fire

A fire at a Chicago apartment building that appears to have been deliberately set killed four people Tuesday, including three children, police said.The fire began around 1:30 a.m. in a three-story building in the South Chicago neighborhood.A preliminary investigation indicates a person returned to the building after a domestic dispute and set fire to the rear porch, police spokesman Anthony Guglielmi said.Officers are searching for a "person of interest wanted for questioning," he said.An emaile