Enlarge / The Pacificas are topped with LIDAR sensors, among other new appendages. (credit: Waymo)

Waymo, the division of Alphabet previously known as Google’s self-driving car project, has sued Uber and its self-driving truck acquisition, Otto, for patent infringement.

In a Medium post published Thursday afternoon, Waymo accused Anthony Levandowski—a former Google engineer now working for Uber—of having downloaded “over 14,000 highly confidential and proprietary design files for Waymo’s various hardware systems.” In particular this allegedly included “Waymo’s LiDAR and circuit board” designs—a total of nearly 10 gigabytes.

Uber did not immediately respond for comment.