NATO Secretary-General Jens Stoltenberg says the military alliance is mulling whether to take action in response to security concerns about Chinese tech giant Huawei, AP reported.

Stoltenberg says some of NATO’s 29 allies have raised concerns about Huawei as they consider investment in 5G communications infrastructure.

He said Thursday that “NATO takes these concerns very seriously.”

Stoltenberg said the allies “will continue to consult, continue to assess, and look into whether NATO has a role to play.” He refused to speculate on what it might do.