The paper, “Line State Estimation under Cyber-Physical Attacks: Theory and Algorithms,” addresses the topology estimation problem after a cyber-physical attack that blocks information from an area of the grid and disconnects an unknown set of lines within the attacked area. In contrast to existing works that assumed the grid to remain connected after attack, our paper considers the possibility of islanding and the resulting unknown changes in the power injections at buses. The work was supported by our NSF-funded CAMPR project.