BOSTON -- The 10-year-old granddaughter of Robert F. Kennedy said that someone tried to abduct her on Cape Cod Thursday, a source told NewsCenter 5.

Saoirse Rosin Hill, daughter of Courtney Kennedy Hill, was returning from playing tennis to the family's home in Hyannisport when two men drove up in a white van.

As the girl walked by the van outside the family's six-acre waterfront compound, one man asked if she wanted a ride but she ran away, the source said.

"Two white males, approximately 50 years old according to the witness, were sitting in a white GMC van. As the girl walked by the van, the driver asked her if she needed a ride. The young girl responded, 'no,' and just did not feel right about the situation and ran home," Barnstable Police Department Sgt. Mark Mellyn said.

The girl told another girl about the incident, and that girl's mother told police. Officials said that they are investigating the incident.

"We are glad that they called and reported this. It is something that we would definitely take a look at," Mellyn said.

Courtney Kennedy Hill is the fifth child of Robert F. Kennedy and Ethel Skakel Kennedy, who called police to thank them for their help in the matter.