WASHINGTON (CNN)  -- Last week's "balloon boy" incident is being investigated by the Federal Aviation Administration, an agency representative said Tuesday.



The Heene family -- including Falcon, second from right -- on CNN's "Larry King Live" last week.



Richard and Mayumi Heene, whose son Falcon was thought for several hours to have flown away in a homemade balloon, are facing a number of local charges, a Colorado sheriff said this week.



The Fort Collins couple could be charged with conspiracy, contributing to the delinquency of a minor and attempting to influence a public servant, Larimer County Sheriff Jim Alderden said Sunday. The family also probably will be charged with filing a false police report, which is a misdemeanor, Alderden said.



Their lawyer, David Lane, said the sheriff was overreaching and that the family deserves the presumption of innocence.  Watch the Heenes' friends talk about the incident »



FAA spokeswoman Diane Spitaliere confirmed Tuesday that the agency was "investigating the circumstances" of the incident, in which police and military scrambled to rescue the 6-year-old boy, who later turned out to be hiding in his family's attic.



A source familiar with the investigation said no record has been found indicating that Richard Heene called the FAA. The agency does not record all of its calls, and the search for a record of any call is continuing, the source said.



The Heenes may have violated FAA regulations barring people from flying balloons or kites within 5 miles of an airport, an FAA official said. The official declined to be named because the case is under investigation.



The giant silver balloon was apparently not visible on radar, the official said, and the FAA is relying on pilot reports to determine its approximate flight path during the roughly three hours it was aloft Thursday.



CNN's Mike M. Ahlers in Washington contributed to this story.
What does the Heene family deserve? What will Federal Aviation Administration do? What are the balloon owners facing? What are balloon's owner facing? What is the Federal Aviation Adminstration looking into? What did the lawyer say?
the presumption of innocence. "investigating the circumstances" a number of local charges, number of local charges, Last week's "balloon boy" incident the sheriff was overreaching and that the family deserves the presumption of innocence.
question: What does the Heene family deserve?, answer: the presumption of innocence. | question: What will Federal Aviation Administration do?, answer: "investigating the circumstances" | question: What are the balloon owners facing?, answer: a number of local charges, | question: What are balloon's owner facing?, answer: number of local charges, | question: What is the Federal Aviation Adminstration looking into?, answer: Last week's "balloon boy" incident | question: What did the lawyer say?, answer: the sheriff was overreaching and that the family deserves the presumption of innocence.