SU(1,1) and SU(2) bundles on AdS4 and complex supergravity solutions

We study eleven dimensional supergravity solutions with an $Ad{S}_7$ factor. By writing $Ad{S}_7$ metric as an $SU(1,1)$ bundle over $Ad{S}_4$ we derive new supergravity solutions. The solutions, however, are obtained in Euclidean signature and thus are necessarily complex. We also discuss $Ad{S}_7$ as an $SU\left(2\right)$ bundle over $Ad{S}_4$, and observe that the two sets of solutions are related by analytic continuation of the scale factor of the fiber.