The first occurred at 11:05 a.m. at the TCF Bank branch inside Jewel-Osco, 2501 W. Schaumburg Rd. in Schaumburg.
The second occurred about 40 minutes later at the TCF inside Jewel-Osco, 217 W. Irving Park Rd., Streamwood.
The offender is described as a Hispanic man, 5-feet-3-inches tall, 200 pounds, between the ages of 25 and 30, black hair, brown eyes and facial hair. He was wearing a black-and-gray "DC" hat, glasses, gray/black/white flannel shirt with a hooded sweatshirt, and tan shorts.
A $1,000 reward is being offered for information leading to his arrest.
Anyone with information is asked to call the FBI: 312-421-6700.