Chicago's holiday weekend was marred by bouts of gunfire and a dozen killings, continuing a yearlong surge in violence in the third largest U.S. city that has pushed the number of murders to a nearly two-decade high.

At least 27 people were shot, seven fatally, in a 48-hour period in Chicago over Christmas weekend, according to the Chicago Police Department. It was the latest bloody chapter in a city besieged by gun violence.

A former Chicago transportation official was sentenced on Monday to 10 years in prison for using his influence to expand contracts for the city's red light traffic camera program in a $2 million bribery scheme.

Illinois faces a big increase in its future pension contributions after the state's largest public retirement system on Friday lowered its assumed investment rate of return to 7 percent from 7.5 percent.

A lawyer for dozens of families from a suburban Chicago high school district argued in court on Monday that students' privacy was being violated at a school that allowed a transgender girl access to the girls' locker room under an agreement with the federal government.

Chicago police chief Eddie Johnson spoke on Sunday about the killing of a black teenager last month by three police officers, trying to chalk it up to "policy violation".

A former U.S. congressman facing legal troubles over tax issues said he would plead not guilty over tax problem.