Federal prosecutors are pursuing a criminal investigation of China’s Huawei Technologies Co. for allegedly stealing trade secrets from U.S. business partners, including technology used by T-Mobile US Inc. to test smartphones, according to people familiar with the matter.

The investigation grew in part out of civil lawsuits against Huawei, including one in which a Seattle jury found Huawei liable for misappropriating robotic technology from T-Mobile’s Bellevue, Wash., lab, the people familiar with the matter said. The probe is at an advanced stage and could lead to an indictment soon, they said.

A Justice Department spokesman declined to comment.

A Huawei spokesman declined to comment on the federal probe but said Huawei and T-Mobile “settled their disputes in 2017 following a U.S. jury verdict finding neither damage, unjust enrichment nor willful and malicious conduct by Huawei in T-Mobile’s trade secret claim.” The company contested the T-Mobile case, but conceded that two employees acted improperly.

The federal investigation puts added pressure on the Chinese technology giant, the world’s largest maker of telecommunications equipment and the No. 2 maker of smartphones world-wide. It comes amid a broader push by the Trump administration to aggressively pursue claims of intellectual property theft and technology transfer by Chinese companies.