WASHINGTON (AP) — China’s military hacked into computer networks of civilian transportation companies hired by the Pentagon at least nine times, breaking into computers aboard a commercial ship, targeting logistics companies and uploading malicious software onto an airline’s computers, Senate investigators said Wednesday.

A yearlong investigation announced by the Senate Armed Services Committee identified at least 20 break-ins or other unspecified cyber events targeting companies, including nine successful break-ins of contractor networks. It blamed China’s government for all the most sophisticated intrusions, although it did not provide any detailed evidence.