F-15 fighter jet
An F-15 fighter jet was scrambled on two separate occasions Saturday to intercept two single-engine planes that violated a flight ban imposed for President Barack Obama's visit to his hometown of Chicago, officials said.
According to AFP, both small aircraft were intercepted "in the vicinity of Chicago," the first at approximately 10:30 am (1430 GMT) and the second at about 4:45 pm (2045 GMT), North American Aerospace Defence Command said in a statement.
Both planes were escorted out of the restricted area without further incident, NORAD said.
No details were give about the make of the first aircraft. The second was a Cessna 172.
Obama was in Chicago to spend the weekend there with his family and to attend the wedding of the daughter of Valerie Jarrett, one of his senior advisers.