At least 18 people were shot and two killed in about a dozen separate shooting incidents across Chicago over the past weekend, said the Chicago Police Department in a Monday update. A man was shot and killed by Chicago police on Sunday after he allegedly fired at officers, critically wounding two people in a hostage situation near the Ford City Mall on the Southwest Side, officials told NBC5, citing police spokesman Tom Ahern. A 22-year-old man was shot and killed on the 2100 block of North Bingham Street about 11:30 p.m. Friday when two people opened fire following an argument, police told the Chicago Sun-Times. The victim was identified as Juan Lopez Mendez, who was killed after being shot in the chest. In another incident, a 16-year-old boy was critically wounded on Saturday at 3 p.m. in the 800 block of East 54th Street in Hyde Park when someone shot him in the chest. …