EDGARTOWN, Mass. (AP) — President Barack Obama's summer vacation on Martha's Vineyard is humming along but the family vibe is different this year. Daughters Malia and Sasha aren't with their parents.

The girls are finishing up at an undisclosed summer camp and the White House says only that they'll eventually join their parents on the island. They won't say exactly when.

First lady Michelle Obama is with her husband. They arrived last Saturday, along with family dog Bo.

One sign of the girls' absence is that Obama has yet to drop by the Bunch of Grapes Bookstore in Vineyard Haven. He typically heads there with them on his first full day of vacation to pick up summer reading.

Obama is scheduled to return to Washington on Sunday.