  A Riemannian manifold is called IP, if the eigenvalues of its skew-symmetric
curvature operator are pointwise constant. It was previously shown that for all
n\ge 4, except n=7, any IP manifold either has constant curvature, or is a
warped product, with some specific function, of a line and a space of constant
curvature. We extend this result to the case n = 7, and also study
3-dimensional IP manifolds.
