In addition, agents have searched Poland's Office of Electronic Communication (UKE) regulator, where the Polish suspect had also worked, according to TVP Info.
Both men are said to have denied any wrongdoing, but many western countries are beginning to think again about using Huawei's telecoms equipment because of security concerns.
But EU officials explained that given the importance of cybersecurity as a threat, which is growing "exponentially", and past concerns related to Huwaei, the Commission made a decision to get involved following internal discussions on Friday morning.
Huawei is a major supplier of telecommunications equipment in Canada, where Bradley had served as chair of the 5G Canada Council, a national trade group promoting adoption of next-generation high-speed wireless technology.
Conservative allies of President Donald Trump, who has taken a vocal and hardline stance against China's approach to intellectual property, and who finds himself in a public showdown with Congressional Democrats over border wall funding, are reportedly trying to send the message that the federal agency's lawsuit against an American business has implications that reverberate globally.
China's embassy has reached out to offer consular services to Wang, according to the South China Morning Post, which adds, "China's foreign ministry expressed grave concerns over the incident".
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A former Polish security official was also arrested.
This week's detention of Wang Weijing follows the December arrest of Huawei's chief financial officer in Canada and United States efforts to blacklist the company internationally over security concerns.
"Both men carried out espionage activities against Poland".
"Huawei has always abided by applicable laws and regulations of the country where it is located. and requires all employees to abide by the country's laws and regulations", it said.
Nonetheless, intelligence bods recommended banning the use of the kit, and official blocks are in place for state-funded projects in the US, Australia and New Zealand. However, the company has faced intense scrutiny in a number of foreign countries, accused of being a threat to national security because of its alleged close connections with the leadership in Beijing.
Huawei, as CNN reports, is one of the foremost telecom companies in China, selling more phones than Apple, with an interest in branching out into a larger, global market.
Huawei in December said it expects to see a 21 percent rise in revenue for 2018 despite what it called "unfair treatment" around the world.
Telenor is now testing 5G networks with the use of Chinese equipment supplied by Huawei, but with Friday's arrests, pressure will only mount on the firm, who sought to substantiate their presence on the continent with the establishment of an European Union headquarters in Brussels in 2018.