The 32-year-old denied the allegations.
A police officer in London pleaded guilty to 49 charges of sexual abuse, including rape, committed over 17 years.
On Wednesday, the 12-person jury in Chicago convicted Mr Kelly of six out of the 13 charges levelled against him.
“The suspect’s arrest followed an alarm raised by the old woman, which attracted the attention of passers-by and neighbours who rushed to the scene and caught the culprit.”
The Arabic teacher, Farouk Adam, is facing a nine-count charge bordering on sexual assault of pupils between the ages of seven and 13.
The police spokesman advised parents and caregivers to take good care of their children, especially the girl-child, to shield them from rapists.
