Warsaw, Jan. 12 -- Poland has arrested a director at the Chinese tech giant Huawei and one of its own former cybersecurity experts and charged them with spying for China, authorities said Friday.

The development comes as the U.S. is exerting pressure on its allies not to use Huawei, the world's biggest maker of telecommunications network equipment, over data security concerns.

The two men - one a Chinese citizen who was a former envoy in Poland before moving over to a senior position at Huawei and the other a Pole who held several top government cybersecurity positions - were arrested Tuesday, according to Poland's Internal Security Agency.

Polish security agents searched the Warsaw offices of Huawei and Orange, Poland's leading commun...